scale
relative magnitude
proportion, ratio
the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree
ratio
the relative magnitudes of two quantities (usually expressed as a quotient)
rate
a magnitude or frequency relative to a time unit
gross margin, margin of profit, profit margin
the ratio gross profits divided by net sales
abundance
(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million
abundance
(physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present
albedo, reflective power
the ratio of reflected to incident light
aspect ratio
the ratio of the width to the height of a tv picture
average
(sports) the ratio of successful performances to opportunities
breadth index, cephalic index, cranial index
ratio (in percent) of the maximum breadth to the maximum length of a skull
efficiency
the ratio of the output to the input of any system
facial index
the ratio (in percent) of the maximum width to the maximum height of the face
f number, focal ratio, speed, stop number
the ratio of the focal length to the diameter of a (camera) lens system
frequency, relative frequency
the ratio of the number of observations in a statistical category to the total number of observations
haematocrit, hematocrit, packed cell volume
the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit
I.Q., IQ, intelligence quotient
a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100)
load factor
(aeronautics) the ratio of an external load to the weight of the aircraft (measured in g)
loss ratio
the ratio of the annual claims paid by an insurance company to the premiums received
Mach number
the ratio of the speed of a moving body to the speed of sound
magnification
the ratio of the size of an image to the size of the object
mechanical advantage
the ratio of the force exerted by a machine to the force applied to it
fuel consumption rate, gas mileage, gasoline mileage, mileage
the ratio of the number of miles traveled to the number of gallons of gasoline burned
betting odds, odds
the ratio by which one better's wager is greater than that of another
magnitude, order of magnitude
a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10
output-to-input ratio
the output power of a transducer divided by the input power
prevalence
(epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population
P/E ratio, price-to-earnings ratio(stock market) the price of a stock divided by its earnings
productivity(economics) the ratio of the quantity and quality of units produced to the labor per unit of time
proportionalitya ratio of two quantities that is constant
quotientthe ratio of two quantities to be divided
index of refraction, refractive indexthe ratio of the velocity of light in a vacuum to that in a medium
relative humiditythe ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature; expressed as a percentage
respiratory quotientthe ratio of the volume of carbon dioxide expired to the volume of oxygen consumed by an organism or cell in a given period of time
factor of safety, safety factorthe ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use
S/N, signal-to-noise, signal-to-noise ratio, signal/noise, signal/noise ratiothe ratio of signal intensity to noise intensity
stoichiometry(chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)
time constantthe ratio of the inductance of a circuit in henries to its resistance in ohms
employee turnover, turnover, turnover ratethe ratio of the number of workers that had to be replaced in a given time period to the average number of workers
loadingthe ratio of the gross weight of an airplane to some factor determining its lift
eccentricity(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis
acceleration(physics) a rate of increase of velocity
deceleration(physics) a rate of decrease in velocity
attrition rate, rate of attritionthe rate of shrinkage in size or number
birth rate, birthrate, fertility, fertility rate, natalitythe ratio of live births in an area to the population of that area; expressed per 1000 population per year
bits per second, bps(computer science) the rate at which data is transferred (as by a modem)
crime ratethe ratio of crimes in an area to the population of that area; expressed per 1000 population per year
data ratethe rate at which circuits or other devices operate when handling digital information
death rate, deathrate, fatality rate, mortality, mortality ratethe ratio of deaths in an area to the population of that area; expressed per 1000 per year
dose ratethe quantity of radiation absorbed per unit time
ESR, erythrocyte sedimentation rate, sed rate, sedimentation ratethe rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates the presence of inflammation
flow, flow rate, rate of flowthe amount of fluid that flows in a given time
fluxthe rate of flow of energy or particles across a given surface
frequence, frequency, oftennessthe number of occurrences within a given time period
GHz, Gc, gigacycle, gigacycle per second, gigahertz1,000,000,000 periods per second
growth rate, rate of growththe rate of increase in size per unit time
Hz, cps, cycle, cycle per second, cycles/second, hertzthe unit of frequency; one hertz has a periodic interval of one second
inflation rate, rate of inflationthe rate of change of prices (as indicated by a price index) calculated on a monthly or annual basis
jerk(mechanics) the rate of change of acceleration
kHz, kc, kilocycle, kilocycle per second, kilohertzone thousand periods per second
kilometers per hour, kilometres per hour, km/h, kphthe ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)
MHz, Mc, megacycle, megacycle per second, megahertzone million periods per second
THz, terahertzone trillion periods per second
metabolic raterate of metabolism; the amount of energy expended in a give period
miles per hour, mphthe ratio of the distance traveled (in miles) to the time spent traveling (in hours)
gait, pacethe rate of moving (especially walking or running)
heart rate, pulse, pulse ratethe rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health
rate of returnthe amount returned per unit of time expressed as a percentage of the cost
rate of respiration, respiratory ratethe rate at which a person inhales and exhales; usually measured to obtain a quick evaluation of a person's health
rev, revolutions per minute, rpmrate of revolution of a motor
sampling rate(telecommunication) the frequency of sampling per unit time
solar constantthe rate at which radiant solar energy is received at the outer layer of the earth's atmosphere
spacingthe time between occurrences of a repeating event
speed, velocitydistance travelled per unit time
pace, tempothe rate of some repeating event
words per minute, wpmthe rate at which words are produced (as in speaking or typing)