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determiner  strong British English pronunciation: a //  weak British English pronunciation: a /ə/

or an  strong British English pronunciation: an /æn/  weak British English pronunciation: an /ən/

A or an is used as an indefinite article, usually followed by a singular countable noun.
A is used when the next word begins with a consonant.
An is used when the next word begins with a vowel sound.
When a word begins with the letter 'u' that is pronounced /juː/, the word is treated as starting with a consonant: a university.
When a word begins with a silent 'h', it is treated as starting with a vowel: an hour.
The names of the letters f, h, l, m, n, r, s, and x begin with vowel sounds, so abbreviations that begin with one of these letters are treated as starting with a vowel: an MPan HGV.
 
  1. 2
    used when you mean any person or thing of a particular type, but you are not referring to a specific one

    You need a dictionary.

    I haven't got an umbrella.

    Children must be accompanied by an adult.

  2. 3
    used when you say what class, type, or group someone or something belongs to, or what job someone has

    He's a liar and a cheat.

    Greece has been a republic since 1973.

    Ruth's father was a lawyer.

  3. 4
    used before a singular noun that represents every person or thing of a particular type

    A dog needs regular exercise.

    A molecule consists of two or more atoms.

  4. 5
    used when you are referring to a person or thing as one of several people or things of this type

    I want you to meet a friend of mine.

    He's a member of the team.

  5. 6
    used in expressions of quantity such as 'a lot', 'a few', or 'a great deal'

    a lot of money

    a bit of luck

    We all appreciate a little encouragement.

  6. 7
    used in numbers and measurements to mean 'one', as in 'a thousand' or 'an hour'

    a million dollars

    a hundred years ago

    a minute or two

  7. 8
    used in phrases showing how much something costs, how often it happens, how fast it goes etc

    Meetings are held four times a year.

    Tomatoes are £1.20 a kilo (=each kilo costs £1.20).

    The car was travelling at 90 miles an hour.

  8. 9
    used before a noun that means a substance, product, food etc when referring to a particular type of it

    Brie is a soft creamy cheese.

    Plants won't grow in a soil that contains too much lime.

  9. 10
    used before the name of some drinks to mean a cup or glass of that drink

    I'll just have a beer, thanks.

    Have you got time for a coffee?

  10. 11
    used before a noun that means a particular quality or feeling when the quality or feeling is described in some way

    Sales staff must have a good working knowledge of French.

    They fought back with a fierce determination that surprised the invaders.

  11. 12
    used before a noun that is formed from a verb and means a single action of that verb

    Can I have a try?

    Let's take a walk round the garden.

  12. 13
    used before a noun that expresses your feelings about a situation

    It's a relief to know they're safe.

    What a shame he couldn't be there to receive the prize!

  13. 14
    used before the name of a particular day, season, or holiday to mean one particular Tuesday, summer, Christmas etc

    It was a bitterly cold winter.

    She was born at six o'clock on a Sunday morning.

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