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an

indefinite article, determiner
     
an S1 W1
XX used when the following word begins with a vowel sound [↪ a]:
an orange
an X-ray
see usage note aWORD CHOICE: WORD CHOICE:

a, an
Before a word beginning with a vowel sound, use an an elephant an umbrella an obvious mistake!! Use an before an 'h' that is not pronounced an hour later an honest explanation!! Use a before a 'u' that is pronounced like 'you' a university a unique opportunity!! Use an before an abbreviation that is pronounced with a vowel sound at the start an SOS call an MP3 fileSee also a

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