moment

mo·ment

M0378000 (mō′mənt)n.1. A brief, indefinite interval of time.2. a. A specific point in time, especially the present time: He is not here at the moment.b. A point in time that is gratifying or noteworthy: Even working on a dictionary has its moments.c. An occasion affording an opportunity: viewed the blunder as a teachable moment.3. A particular period of importance, influence, or significance in a series of events or developments: a great moment in history; waiting for her big moment.4. Outstanding significance or value; importance: a discovery of great moment.5. A brief period of time that is characterized by a quality, such as excellence, suitability, or distinction: a lackluster performance that nevertheless had its moments.6. Philosophy a. An essential or constituent element, as of a complex idea.b. A phase or aspect of a logically developing process.7. Abbr. M Physics a. The product of a quantity, such as force or mass, and its perpendicular distance from a reference point.b. The tendency to cause rotation about a point or axis.8. Statistics The expected value of a positive integer power of a random variable. The first moment of a random variable is the mean of its probability distribution.

[Middle English, from Old French, from Latin mōmentum, from *movimentum; see momentum.]Synonyms: moment, instant, minute¹, second¹, jiffy, flash
These nouns denote a brief interval of time. A moment is an indeterminately short but significant period: I'll be with you in a moment. Instant is a period of time almost too brief to detect; it implies haste: He hesitated for just an instant. Minute is often interchangeable with moment and second with instant: The alarm will ring any minute. I'll be back in a second. Jiffy and flash are somewhat informal and usually combine with in a; in a jiffy means in a short space of time, while in a flash suggests the almost imperceptible duration of a flash of light: He went to the store but will be back in a jiffy. She finished the job in a flash. See Also Synonyms at importance.

moment

(ˈməʊmənt) n1. a short indefinite period of time: he'll be here in a moment. 2. a specific instant or point in time: at that moment the doorbell rang. 3. the moment the present point of time: at the moment it's fine. 4. import, significance, or value: a man of moment. 5. (General Physics) physics a. a tendency to produce motion, esp rotation about a point or axisb. the product of a physical quantity, such as force or mass, and its distance from a fixed reference point. See also moment of inertia6. (Statistics) statistics the mean of a specified power of the deviations of all the values of a variable in its frequency distribution. The power of the deviations indicates the order of the moment and the deviations may be from the origin (giving a moment about the origin) or from the mean (giving a moment about the mean)[C14: from Old French, from Latin mōmentum, from movēre to move]

mo•ment

(ˈmoʊ mənt)

n. 1. an indefinitely short period of time; instant. 2. the present time or any other particular time (usu. prec. by the): He is busy at the moment. 3. a definite period or stage, as in a course of events: at that moment in history Rome was a republic. 4. importance or consequence: a decision of great moment. 5. a time or period of success, excellence, satisfaction, etc.: My job has its moments. 6. Statistics. the mean or expected value of the product formed by multiplying together a set of one or more variates or variables each to a specified power. 7. Mech. a. a tendency to produce motion, esp. about an axis. b. the product of a physical quantity and its directed distance from an axis. [1300–50; Middle English < Latin mōmentum motion, cause of motion, hence, influence, essential factor, moment of time =mō- (variant s. of movēre to move) + -mentum -ment] syn: See importance.

moment

extemporaneous, impromptu - Extemporaneous means "prepared in advance and carried out with few or no notes," while impromptu means "totally unprepared, performed on the spur of the moment"—but this distinction has been all but lost.
moment, momentum - Latin momentum, from movere, "move," and -mentum, is the source of moment and momentum, which first meant "moving power."
moment of truth - A translation of a Spanish expression referring to the time of the final sword thrust in a bullfight.
momentarily, presently - Momentarily means "in a moment"; presently means "soon" or "shortly."

moment

In air transport, the weight of a load multiplied by its distance from a reference point in the aircraft.

moment

1. 'moment'

A moment is a very short period of time.

She hesitated for only a moment.A few moments later he heard footsteps.2. 'the moment'

The moment is often used as a conjunction to say that something happens or is done at the same time as something else, or immediately after it.

The moment I heard the news, I rushed over to her house.

When you use the moment in this way to talk about the future, you use the present simple after it. Don't use a future form.

The moment he arrives, ask him to come and see me.3. 'at the moment'

At the moment means now, at the present time.

I'm very busy at the moment.

Be Careful!
Don't say 'I'm very busy in the moment' or 'I'm very busy in this moment'.

4. 'in a moment'

You can use in a moment to mean 'soon'.

Wait there I'll be back in a moment.

moment

The turning effect produced by a force acting around a point.

Thesaurus

Noun	1.	moment - a particular point in time; "the moment he arrived the party began"instant, minute, secondclimax, culmination - the decisive moment in a novel or play; "the deathbed scene is the climax of the play"point in time, point - an instant of time; "at that point I had to leave"eleventh hour, last minute - the latest possible moment; "money became available at the eleventh hour"; "at the last minute the government changed the rules"moment of truth - a crucial moment on which much dependsmoment of truth - the moment in a bullfight when the matador kills the bullpinpoint - a very brief moment; "they were strangers sharing a pinpoint of time together"time - a suitable moment; "it is time to go"psychological moment - the most appropriate time for achieving a desired effect
	2.	moment - an indefinitely short time; "wait just a moment"; "in a mo"; "it only takes a minute"; "in just a bit"mo, second, minute, bittime - an indefinite period (usually marked by specific attributes or activities); "he waited a long time"; "the time of year for planting"; "he was a great actor in his time"instant, jiffy, New York minute, split second, trice, twinkling, wink, blink of an eye, heartbeat, flash - a very short time (as the time it takes the eye to blink or the heart to beat); "if I had the chance I'd do it in a flash"
	3.	moment - at this time; "the disappointments of the here and now"; "she is studying at the moment"here and now, present momentnowadays, present - the period of time that is happening now; any continuous stretch of time including the moment of speech; "that is enough for the present"; "he lives in the present with no thought of tomorrow"
	4.	moment - having important effects or influence; "decisions of great consequence are made by the president himself"; "virtue is of more moment than security"; "that result is of no consequence"consequence, importmatter - (used with negation) having consequence; "they were friends and it was no matter who won the games"significance - the quality of being significant; "do not underestimate the significance of nuclear power"hell to pay - dire consequences; "when the pig ran away there was hell to pay"
	5.	moment - a turning force produced by an object acting at a distance (or a measure of that force)force - (physics) the influence that produces a change in a physical quantity; "force equals mass times acceleration"moment of inertia - the tendency of a body to resist angular accelerationmoment of a couple - given two equal and opposite forces, the product of the force and the distance between themdipole moment - the moment of a dipole
	6.	moment - the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed valuestatistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parametersstatistic - a datum that can be represented numericallysecond moment - the expected value of the square of the deviations of a random variable from the point of originvariance - the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value

moment

noun1. instant, second, minute, flash, shake (informal), tick (Brit. informal), no time, twinkling, split second, jiffy (informal), trice, two shakes (informal), two shakes of a lamb's tail (informal), bat of an eye (informal) In a moment he was gone.2. time, point, stage, instant, point in time, hour, juncture At this moment a car stopped outside the house.3. importance, concern, value, worth, weight, import, consequence, substance, significance, gravity, seriousness, weightiness I was glad I had nothing of great moment to do that afternoon.Quotations
"in the twinkling of an eye" Bible: I Corinthians

moment

noun1. A very brief time:crack, flash, instant, minute, second, trice, twinkle, twinkling, wink.Informal: jiff, jiffy.Chiefly British: tick.2. A particular interval of time that is limited and often crucial:instant, juncture, point.3. The quality or state of being important:concern, concernment, consequence, import, importance, significance, significancy, weight, weightiness.

Translations

瞬间时刻片刻

moment

(ˈməumənt) noun1. a very short space of time. I'll be ready in a moment; after a few moments' silence. 片刻，瞬间 2. a particular point in time. At that moment, the telephone rang.时刻ˈmomentary adjective lasting for only a moment. a momentary feeling of fear.倾刻的ˈmomentarily ((American) moumənˈte-) adverb短暂地moˈmentous (-ˈmen-) adjective of great importance. a momentous event.重大的moˈmentously adverb重大地at the moment at this particular time; now. She's rather busy at the moment.此刻the moment (that) exactly when. I want to see him the moment he arrives. 一 ... 就 ... ，这一刻

moment

→ 瞬间zhCN

Just a moment, please → 请稍等

moment

moment,

in physics and engineering, term designating the product of a quantity and a distance (or some power of the distance) to some point associated with that quantity. The most theoretically useful moments are moments of masses, areas, lines, and forces, including magnetic force. The concept of torque (propensity to turn about a point) is the moment of force. If a force tends to rotate a body about some point, then the moment, or turning effect, is the product of the force and the distance from the point to the direction of the force. The application of this concept is illustrated by pushing open a door: the farther from the hinge the push is applied, the less force is required. The principle of the moment of a force is perhaps best seen in the use of a leverlever,
simple machine consisting of a bar supported at some stationary point along its length and used to overcome resistance at a second point by application of force at a third point. The stationary point of a lever is known as its fulcrum.
..... Click the link for more information. . Extensions of this concept are important in mechanics, in topics such as inertia, center of gravity, equilibrium, and stability of structures, and in architectural problems. The moment of inertia of a body about a point is the sum, for each particle in the body, of the mass of the particle and the square of its distance from the point. The angular momentum of a body about a fixed axis is equal to the product of the momentum and the length of the moment arm (distance from the body to the axis). A torque acting on a rigid body acts to change its angular momentum by producing an angular acceleration.

Moment

a mathematical concept that plays an important role in mechanics and probability theory. If we have a system of point masses m₁, m₂, … (m_i > 0) lying on a line and if their abscissas with respect to some origin O are equal to x₁, x₂, …, respectively, then the sum

x₁^km₁ + x₂^km₂ + … = Σ _ix_i^km_i

is called the kth order moment of the system about the point O. In mechanics the first-order moment is called the static moment and the second-order moment is called the moment of inertia. If in the expression for the moment all the abscissas are replaced by their absolute values, a quantity called the absolute moment is obtained. The point with abscissa (Σⁱx_im_i)/(Σ_im_i) is called the center of mass of a given system of masses. Moments computed about the center of mass are called central moments. The central, first-order moment for any system is equal to zero. Of all the moments of inertia, the central moment of inertia is the smallest. Chebyshev’s inequality states that the sum of the masses located at a distance greater than a from the point O does not exceed the system’s moment of inertia with respect to O divided by a². If a mass distribution has a density f(x) ≧ 0, then the integral

is called the moment of order k, provided that it is absolutely convergent. In the case of an arbitrary mass distribution, the sums in the expressions for the moments are replaced by Stieltjes integrals; the Stieltjes integral first arose in this way. All the definitions and theorems mentioned above remain valid in this case.

In probability theory, the different possible values of a random quantity play the role of abscissas, and the corresponding probabilities take the place of the masses. The first-order moment is called the mathematical expectation value of the given random quantity, and the central, second-order moment is called its dispersion. The first-order moment is always the abscissa of the center, since the total mass is unity. Chebyshev’s inequality, referred to above, plays an extremely important role in probability theory. In mathematical statistics, moments usually function as basic, statistical quantities summarizing the characteristics of distributions.

The problem in mathematical analysis of the characterization of the properties of a function f(x) by the properties of the sequence of its moments

is called the problem of moments. This problem was first considered by P. L. Chebyshev in 1874 in connection with his studies in probability theory (the attempt to prove the central limit theorem). Later, powerful new methods of mathematical analysis were developed in the investigation of this problem.

REFERENCES

Chebyshev, P. L. Izbr. trudy. Moscow, 1955.
Markov, A. A. Izbr. trudy. Moscow, 1951.
Gnedenko, B. V. Kurs teorii veroiatnostei, 5th ed. Moscow, 1969.
Loève, M. Teoriia veroiatnostei. Moscow, 1962. (Translated from English.)

moment

[′mō·mənt] (mechanics) Static moment of some quantity, except in the term “moment of inertia.” (statistics) The n th moment of a distribution ƒ(x) about a point x₀ is the expected value of (x - x₀)ⁿ, that is, the integral of (x - x₀)ⁿ d ƒ(x), where d ƒ(x) is the probability of some quantity's occurrence; the first moment is the mean of the distribution, while the variance may be found in terms of the first and second moments.

moment

The property by which a force tends to cause a body, to which it is applied, to rotate about a point or line; equal in magnitude to the product of the force and the perpendicular distance of the point from the line of action of the force.

moment

Physicsa. a tendency to produce motion, esp rotation about a point or axis b. the product of a physical quantity, such as force or mass, and its distance from a fixed reference point

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Patient discussion about moment

moment

Synonyms for moment

noun instant

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noun time

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noun importance

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Synonyms for moment

noun a very brief time

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noun a particular interval of time that is limited and often crucial

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noun the quality or state of being important

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Synonyms for moment

noun a particular point in time

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noun an indefinitely short time

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noun at this time

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noun having important effects or influence

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noun a turning force produced by an object acting at a distance (or a measure of that force)

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noun the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value

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