There are 6 definitions of a in English:

a1

Syllabification: a
Pronunciation:
 
, ə
 
/
(an before a vowel sound)

determiner

1Used when referring to someone or something for the first time in a text or conversation: a man came out of the room it has been an honor to have you we need people with a knowledge of languages 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.
3Used when expressing rates or ratios; in, to, or for each; per: typing 60 words a minute cost as much as eight dollars a dozen
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

1 The article a can be pronounced either /ā/, when stressed (“He gave you a flower?”—that is, only one flower), or /ə/, when unstressed (“He gave you a flower?”—that is, the emphasis is on flower, not on the number of flowers). The form an is used before words beginning with a vowel sound. 2 On the question of using a or an before words beginning with h, see also an (usage).

Definition of a in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal

There are 6 definitions of a in English:

A2

Syllabification: 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.
1.4 (a) Chess Denoting the first file from the left, as viewed from white’s side of the board.
1.5 (usually a) The first fixed quantity in an algebraic expression.
1.6 (A) The human blood type (in the ABO system) containing the A agglutinogen and lacking the B.
2A shape like that of a capital A: [in combination]: an A-shape See also A-frame, A-line.
3 Music The sixth note of the diatonic scale of C major.
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.

Definition of a in:

There are 6 definitions of a in English:

A3

Syllabification: A

abbreviation

1Ace (used in describing play in bridge and other card games): you cash AK of hearts
1.1Ampere(s).
1.2 (Å) Ångstrom(s).
1.3Answer: Q: What’s the senator’s zodiac sign? A: He’s a Leo
1.4(In personal ads) Asian.
1.5A dry cell battery size.
1.6British informal A level.

Definition of a in:

There are 6 definitions of a in English:

a-4

Syllabification: a-

prefix

1To; toward: aside ashore
1.1In a specified state or manner: asleep aloud
1.2In the process of (an activity): a-hunting
1.3On: afoot
1.4In: nowadays

Origin

Old English, unstressed form of on.

Definition of a in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal

There are 6 definitions of a in English:

a-5

Syllabification: a-

prefix

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

Definition of a in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal

There are 6 definitions of a in English:

a-6

Syllabification: a-

prefix

1Of: anew
[unstressed form of of]
2Utterly: abash
[from Anglo-Norman French (corresponding to Old French e-, es-), from Latin ex]

Definition of a in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal