单词 | a |
释义 | a1/ə / /eɪ /(an before a vowel sound) determiner 1Used when mentioning someone or something for the first time in a text or conversation: a man came out of the room it has been an honour to meet you...
1.1Used with units of measurement to mean one such unit: a hundred a quarter of an hour...
1.2 [with negative] One single; any: I simply haven’t a thing to wear...
1.3Used when mentioning the name of someone not known to the speaker: a Mr Smith telephoned...
1.4Someone like (the name specified): you’re no better than a Hitler...
2Used to indicate membership of a class of people or things: he is a lawyer this car is a BMW...
3In, to, or for each; per (used when expressing rates or ratios): typing 60 words a minute a move to raise petrol prices by 3p a litre...
UsageOn the question of using a or an before words beginning with h, see an (usage). OriginMiddle English: weak form of Old English ān 'one'. a2abbreviation 1(In travel timetables) arrives: Penzance a 0915 2 [in combination] (In units of measurement) atto- (10−18). 3British (With reference to sporting fixtures) away: March 15 Sheffield United (a) 4(Used before a date) before: a1200 From Latin ante symbol (a) Physics Acceleration. A3/eɪ /(also a) noun (plural As or A's) 1The first letter of the alphabet. 1.1Denoting the first in a set of items, categories, sizes, etc. 1.2Denoting the first of two or more hypothetical people or things: suppose A had killed B 1.3The highest class of academic mark: a dazzling array of straight A’s 1.4(In the UK) denoting the most important category of road, other than a motorway: the A34 busy A-roads 1.5Denoting the highest-earning socio-economic category for marketing purposes, including top management and senior professional personnel. 1.6 (a) Chess Denoting the first file from the left, as viewed from White’s side of the board. 1.7 (usually a) The first constant to appear in an algebraic expression. 1.8 Geology Denoting the uppermost soil horizon, especially the topsoil. 1.9The human blood type (in the ABO system) containing the A antigen and lacking the B. 1.10(With numeral) denoting a series of international standard paper sizes each twice the area of the next, as A0, A1, A2, A3, A4, etc., A4 being 210 × 297 mm. 2A shape like that of a capital A: [in combination]: an A-shape 3 Music The sixth note of the diatonic scale of C major. The A above middle C is usually used as the basis for tuning and in modern music has a standard frequency of 440 Hz. 3.1A key based on a scale with A as its keynote. Phrasesfrom A to B from A to Z plan A A4/eɪ /abbreviation 1(In card games) ace: you cash ♥AK 2Against (heading the column in a table of sports results which shows the goals or points scored against each club). 3 informal A level. 4Ampere(s). 5 (Å) Ångstrom(s). 6Attack (in designations of US aircraft types): an A-10 7Answer: Q: What is a hung parliament? A: One in which no single party has an overall majority 8(In names of sports clubs) Athletic: Dunfermline A 9Austria (international vehicle registration). a-5/ə/prefix 1To; towards: aside ashore 1.1In the process of (an activity): a-hunting 1.2In a specified state: aflutter 1.3On: afoot 1.4In: nowadays OriginOld English, unstressed form of on. a-6/ə/prefix Variant spelling of ad- assimilated before sc, sp, and st (as in ascend, aspire, and astringent). a-7/ə/prefix 1Of: anew 2Utterly: abash OriginSense 1 is an unstressed form of of; sense 2 is from Anglo-Norman French a- (Old French e-, es-), from Latin ex. |
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