Main definitions of a in English

: a1a2A3

a1

(also an)

Pronunciation /eɪ//ə/

determiner

  • 1Used when mentioning someone or something for the first time in a text or conversation.

    ‘a man came out of the room’
    Compare with the
    ‘it has been an honour to meet you’
    • ‘"That campaign definitely had an effect," she says.’
    • ‘My wife got me an unexpected Christmas gift this year.’
    • ‘An internal report written by a manager at the nuclear waste reprocessing plant was leaked this week.’
    • ‘We had to write a story about a natural disaster for creative writing.’
    • ‘Bob's conducting a three-year internet romance with a girl he's never met.’
    • ‘Jack crouched down and hid behind a tree trunk.’
    • ‘I received an email from Jo today.’
    • ‘He has also written an opera and translated Dante's Inferno in order to produce an illustrated book of it.’
    • ‘Before making a decision, do an assessment of how you want to use your phone.’
    • ‘Children need a place for their computer equipment, and parents need closet space for their clothing.’
    1. 1.1 Used with units of measurement to mean one such unit.
      ‘a hundred’
      ‘a quarter of an hour’
      • ‘I stopped to pick up a gallon of milk on my way home from work.’
      • ‘I sent off an e-mail, just an hour ago, and he's already got me back online.’
      • ‘There is barely an ounce of fat on his body, and he continues to make his team-mates look chubby.’
      • ‘I look at these miserable people, and wouldn't trade my life with theirs for a million dollars.’
      • ‘The attack came amid a major upsurge in violence across the country that has left a thousand dead.’
      • ‘About a mile further down the road, another dog ran out in front of the taxi.’
    2. 1.2with negative One single; any.
      ‘I simply haven't a thing to wear’
      • ‘I think there's not a person born that doesn't have a gift to offer in some way.’
      • ‘The film looks fantastic: there is not a spot, or a scratch, or a visual defect to be seen.’
      • ‘Most refugees say they never saw a drop of food aid - despite almost one million tonnes flooding into the country every year.’
      • ‘Incensed at the fiasco, I went back to the website to try and find a telephone number to call - not a thing!’
      • ‘I had to own up to the fact that I'd never read a word by Crofts.’
    3. 1.3 Used when mentioning the name of someone not known to the speaker.
      ‘a Mr Smith telephoned’
      • ‘Does anyone know a Mr Daeller?’
      • ‘The latest letter was from a Mrs Singh, who complained about two radio stations.’
      • ‘She was born in about 1670, the daughter of a Mr Freeman of Holbeach in Lincolnshire.’
      • ‘On September 29 a letter arrived at our address for a Ms L Doherty.’
      • ‘He was sent two poems from a Miss Ethel Malley, who wrote saying they were found among her brother's possessions after his death.’
    4. 1.4 Someone like (the name specified)
      ‘you're no better than a Hitler’
      • ‘Regarding academic medicine, it has become increasingly difficult for a Freud or a Mendel to gain recognition without university affiliation or corporate sponsorship.’
      • ‘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.’
      • ‘Moore says that the organization has passed its Chamberlain period, and is now in need of a Churchill.’
      • ‘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’
    • ‘She's a banker, married to a stockbroker, and they have a daughter about the same age as Amy.’
    • ‘In 1984 he was granted his fervent wish to acquire a Picasso.’
    • ‘Notice that every car seen in the show is a Chevrolet, out of consideration for their sponsor.’
    • ‘Lilly is a Siamese cat who survived a two-week cross-country move while stuck in a drawer.’
    • ‘My mom's a pharmacist and my dad's a realtor.’
  • 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’
    • ‘The site takes in 2,000 tons of trash on a typical day, charging an average $30 a ton.’
    • ‘The truckers are angry at the rise in diesel prices, which currently average 81.3p a litre.’
    • ‘I type 15 words a minute with a lot of mistakes.’
    • ‘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.’

Usage

On the question of using a or an before words beginning with h, see an

Origin

Middle English: weak form of Old English ān ‘one’.

Pronunciation

a

/eɪ//ə/

Main definitions of a in English

: a1a2A3

a2

  • 1(in travel timetables) arrives.

    ‘Penzance a 0915’
  • 2in 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’

"a"
Physics
  • Acceleration.

Main definitions of a in English

: a1a2A3

A3

(also a)

noun

  • 1The first letter of the alphabet.

    1. 1.1 Denoting the first in a set of items, categories, sizes, etc.
    2. 1.2 Denoting the first of two or more hypothetical people or things.
      ‘suppose A had killed B’
    3. 1.3 The highest class of academic mark.
      ‘a dazzling array of straight A's’
    4. 1.4 (in the UK) denoting the most important category of road, other than a motorway.
      ‘the A34’
      ‘busy A-roads’
    5. 1.5 Denoting the highest-earning socio-economic category for marketing purposes, including top management and senior professional personnel.
    6. 1.6Chess Denoting the first file from the left, as viewed from White's side of the board.
    7. 1.7 The first constant to appear in an algebraic expression.
    8. 1.8Geology Denoting the uppermost soil horizon, especially the topsoil.
    9. 1.9 The human blood type (in the ABO system) containing the A antigen and lacking the B.
    10. 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’
  • 3Music
    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.

    1. 3.1 A 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’
      • ‘The drivers are not concentrating and just going from A to B to distribute the goods.’
      • ‘Ask the ‘British Bobby’ for the nearest toilet or how to get from A to B, it is all part of his job.’
      • ‘People who need to travel from A to B will take an alternative route.’
      • ‘We need to put all the other things to one side and get from A to B safely at the appropriate speed.’
      • ‘I wanted to show people how to get from A to B in your life.’
      • ‘As well as finding you the best way from A to B, the operators can also provide an emergency and breakdown service.’
      • ‘How else would you get someone from A to B unless you've used an airplane?’
      • ‘She said: ‘People will still be able to get from A to B - it may just take them that bit longer.’’
      • ‘It must also be rather boring and predictable sailing directly and single-mindedly from A to B to C.’
      • ‘You could go from A to B directly, walking fast, neglecting the scenery, or instead you could choose to take your time.’
  • from A to Z

    • Over the entire range; completely.

      ‘make sure you understand the subject from A to Z’
      • ‘If everything is explained to us, from A to Z, then even an idiot can grasp it.’
      • ‘The person has to fit from A to Z or else they're just not wanted.’
      • ‘If you complete all the steps from A to Z, the mission is a success.’
      • ‘Instead, the opposition wants an independent committee to oversee the election from A to Z.’
      • ‘The process moves from A to Z without cutting corners.’
      • ‘They moved in with a heavy barrage of speculation from A to Z.’
      • ‘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 could argue about who was smarter, who the teachers liked best, anything from A to Z they could argue about.’
      • ‘It wouldn't be something I'd have to take from A to Z, point-by-point, and argue and describe.’
      • ‘Going through your list of accounts from A to Z won't really work.’
  • 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
      • ‘We had a review in the first week of the work to see if plan A was still the best way forward.’
      • ‘Why not just carry on with Plan A as if nothing has happened?’
      • ‘Plan A is actually just to turn up on the day and make it up.’
      • ‘However, since football is now a 16-man game, he can bring on talented substitutes if plan A is not working.’
      • ‘We can't even resort to Plan B these days because we haven't got a Plan A!’
      • ‘I think the only reason you're back now is because Plan A disintegrated and I'm your contingency.’
      • ‘If their coaches are talking differently October 1, you'll know Plan A didn't quite work.’
      • ‘Plan A, to propose on Detonator, backfired when she saw the ride on the website and refused to go on it.’
      • ‘Business as usual - Plan A - is clearly not working.’
      • ‘You've got to still have a Plan B if Plan A doesn't work.’
      • ‘Plan A, business as usual, is no longer a viable option.’
      • ‘I don't know what plan A was, but it evidently failed.’
      • ‘That's plan A, but I've a number of other plans.’
      • ‘You either continue with plan A, or you look at alternatives.’
      • ‘We had Plan A and Plan B and Plan C.’
      • ‘This is plan A; this is what I plan to do.’
      • ‘Have a plan B in case plan A fails.’
      • ‘Fortunately, I have appealing contingency plans, but still first I'll apply myself to plan A with all my strength.’
      • ‘Plan A had been for me to travel with Connie on the train, but there were no seats available.’

Pronunciation

A

/eɪ/

  • 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).

  • 3informal A level.

  • 4Ampere(s).

  • 5Ångstrom(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).