There are 6 definitions of a in English:

a1

Line breaks: a
Pronunciation:
 
, 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 Compare with the.
More example sentences
  • Bob's conducting a three-year internet romance with a girl he's never met.
  • He has also written an opera and translated Dante's Inferno in order to produce an illustrated book of it.
  • Children need a place for their computer equipment, and parents need closet space for their clothing.
1.1Used with units of measurement to mean one such unit: a hundred a quarter of an hour
More example sentences
  • I sent off an e-mail, just an hour ago, and he's already got me back online.
  • About a mile further down the road, another dog ran out in front of the taxi.
  • I stopped to pick up a gallon of milk on my way home from work.
1.2 [with negative] One single; any: I simply haven’t a thing to wear
More example sentences
  • Incensed at the fiasco, I went back to the website to try and find a telephone number to call - not a thing!
  • I think there's not a person born that doesn't have a gift to offer in some way.
  • I had to own up to the fact that I'd never read a word by Crofts.
1.3Used when mentioning the name of someone not known to the speaker: a Mr Smith telephoned
More example sentences
  • She was born in about 1670, the daughter of a Mr Freeman of Holbeach in Lincolnshire.
  • He was sent two poems from a Miss Ethel Malley, who wrote saying they were found among her brother's possessions after his death.
  • Does anyone know a Mr Daeller?
1.4Someone like (the name specified): you’re no better than a Hitler
More example sentences
  • Called a Judas by his countrymen, he received an elbow from another player, and left the pitch injured.
  • What he lacks is the charisma of an Olivier, whose epochal Coriolanus is dazzlingly evoked in two pages of Kenneth Tynan's Curtains.
  • You need the methods of a Roosevelt.
2Used to indicate membership of a class of people or things: he is a lawyer this car is a BMW
More example sentences
  • She's a banker, married to a stockbroker, and they have a daughter about the same age as Amy.
  • My mom's a pharmacist and my dad's a realtor.
  • Lilly is a Siamese cat who survived a two-week cross-country move while stuck in a drawer.
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
More example sentences
  • The truckers are angry at the rise in diesel prices, which currently average 81.3p a litre.
  • The price of gold rose last week to $309 an ounce - and at one point was $312, its highest for two years.
  • You can't drive over five miles an hour down any street in New York.

Origin

Middle English: weak form of Old English ān 'one'.

Usage

On the question of using a or an before words beginning with h, see an (usage).

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Definition of a in:

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Word of the day wiseacre
Pronunciation: ˈwʌɪzeɪkə
noun
a know-all…

There are 6 definitions of a in English:

a2

Line breaks: a

abbreviation

1(In travel timetables) arrives: Penzance a 0915
1.1 [in combination] (In units of measurement) atto- (10−18).
1.2British (With reference to sporting fixtures) away: March 15 Sheffield United (a)
1.3(Used before a date) before: a1200
[from Latin ante]

symbol

(a) Physics Back to top  
Acceleration.

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Definition of a in:

There are 6 definitions of a in English:

A1

Line breaks: A
(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.

Phrases

from A to B

From one’s starting point to one’s destination: most road atlases will get you from A to B
More example sentences
  • The drivers are not concentrating and just going from A to B to distribute the goods.
  • She said: ‘People will still be able to get from A to B - it may just take them that bit longer.’
  • We need to put all the other things to one side and get from A to B safely at the appropriate speed.

from A to Z

Over the entire range; completely: make sure you understand the subject from A to Z
More example sentences
  • The person has to fit from A to Z or else they're just not wanted.
  • Most of my work has been in the comedy genre, so it's a dream role to get a chance to play a character that has a trajectory from A to Z.
  • They moved in with a heavy barrage of speculation from A to Z.

plan A

One’s original plan or strategy: plan A having gone horribly wrong, Ferguson used the interval to change his formation Compare with plan B.
More example sentences
  • Plan A had been for me to travel with Connie on the train, but there were no seats available.
  • We had a review in the first week of the work to see if plan A was still the best way forward.
  • Plan A, to propose on Detonator, backfired when she saw the ride on the website and refused to go on it.

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Definition of A in:

There are 6 definitions of a in English:

A2

Line breaks: A

abbreviation

1(In card games) ace: you cash ♥AK
1.1Against (heading the column in a table of sports results which shows the goals or points scored against each club).
1.2 informal A level.
1.3Ampere(s).
1.4 (Å) Ångstrom(s).
1.5Answer: Q: What is a hung parliament? A: One in which no single party has an overall majority
1.6(In names of sports clubs) Athletic: Dunfermline A
1.7Attack (in designations of US aircraft types).
1.8Austria (international vehicle registration).

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Definition of A in:

There are 6 definitions of a in English:

a-3

prefix

variant spelling of ad- assimilated before sc, sp, and st (as in ascend, aspire, and astringent).

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Definition of a- in:

There are 6 definitions of a in English:

a-4

prefix

1Of: anew
2Utterly: abash

Origin

sense 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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Definition of a- in: