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- determiner
- used when referring to someone or something for the first time in a text or conversation. Compare with the."a man came out of the room" · "it has been an honour to meet you" · "we need people with a knowledge of languages"
- used with units of measurement to mean one such unit:"a hundred" · "a quarter of an hour"
- one single; any:"I simply haven't a thing to wear"
- used when mentioning the name of someone not known to the speaker:"a Mr Smith telephoned"
- someone like (the name specified):"you're no better than a Hitler"
- used to indicate membership of a class of people or things:"he is a lawyer" · "this car is a BMW"
- in, 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"
OriginMiddle English: weak form of Old English ān ‘one’.suffix- forming ancient or Latinized modern names of animals and plants:"primula"
- forming names of oxides:"baryta"
- forming geographical names:"Africa"
- forming ancient or Latinized modern feminine forenames:"Lydia"
- forming nouns from Italian, Portuguese, and Spanish:"duenna" · "stanza"
Originrepresenting a Greek, Latin, or Romance feminine singular.prefix- variant spelling of ad- assimilated before sc, sp, and st (as in ascend, aspire, and astringent).
nounA (noun) · A's (plural noun) · As (plural noun) · a (noun) · as (plural noun)- the first letter of the alphabet.
- denoting the first in a set of items, categories, sizes, etc.
- denoting the first of two or more hypothetical people or things:"suppose A had killed B"
- the highest class of academic mark:"a dazzling array of straight A's"
- (in the UK) denoting the most important category of road, other than a motorway:"the A34" · "busy A-roads"
- denoting the highest-earning socio-economic category for marketing purposes, including top management and senior professional personnel.
- chessdenoting the first file from the left, as viewed from White's side of the board.
- the first constant to appear in an algebraic expression.
- geologydenoting the uppermost soil horizon, especially the topsoil.
- the human blood type (in the ABO system) containing the A antigen and lacking the B.
- (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.
- a shape like that of a capital A:"an A-shape"
- musicthe 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.
- a key based on a scale with A as its keynote.
abbreviation- (in card games) ace:"you cash ♥AK"
- against (heading the column in a table of sports results which shows the goals or points scored against each club).
- informalA level.
- ampere(s).
- ångstrom(s).
- attack (in designations of US aircraft types):"an A-10"
- answer:"Q: What is a hung parliament? A: One in which no single party has an overall majority"
- (in names of sports clubs) Athletic:"Dunfermline A"
- Austria (international vehicle registration).
ǎ ( 啊 ) - English meaning, Chinese ideograms and …
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