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Definition of a indefinite article from the Oxford Advanced Learner's Dictionary

a

indefinite article
 
/ə/, strong form
 
/eɪ/
 
/ə/, strong form
 
/eɪ/
(also an
 
/ən/, strong form
 
/æn/
 
/ən/, strong form
 
/æn/
)
The form a is used before consonant sounds and the form an before vowel sounds. When saying abbreviations like ‘FM’ or ‘UN’, use a or an according to how the first letter is said. For example, F is a consonant, but begins with the sound /e/ and so you say: an FM radio . U is a vowel but begins with /j/ and so you say: a UN declaration .
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  1. used before countable or singular nouns referring to people or things that have not already been mentioned
    • a man/horse/unit
    • an aunt/egg/hour/X-ray
    • I can only carry two at a time.
    • There's a visitor for you.
    • She's a friend of my father's (= one of my father's friends).
  2. used to show that somebody/something is a member of a group or profession
    • Their new car's a BMW.
    • She's a Buddhist.
    • He's a teacher.
    • Is that a Monet (= a painting by Monet)?
  3. any; every
    • A lion is a dangerous animal.
  4. used before uncountable nouns when these have an adjective in front of them, or phrase following them
    • a good knowledge of French
    • a sadness that won’t go away
  5. used in front of two nouns that are seen as a single unit
    • a knife and fork
  6. used instead of one before some numbers
    • A thousand people were there.
  7. used when talking about prices, quantities and rates synonym per
    • They cost 50p a kilo.
    • I can type 50 words a minute.
    • He was driving at 50 miles an hour.
  8. a person like somebody
    • She's a little Greta Thunberg.
  9. used before somebody’s name to show that the speaker does not know the person
    • There's a Mrs Green to see you.
  10. used before the names of days of the week to talk about one particular day
    • She died on a Tuesday.
  11. Word OriginMiddle English: weak form of Old English ān ‘one’.
See a in the Oxford Advanced American DictionarySee a in the Oxford Learner's Dictionary of Academic English
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adjective
 
 
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