an

Meanings

1. 1
   det

   The form of "a" used before words that begin with a vowel sound; refers to one person or thing not already mentioned.

   I'll be there in an hour.

2. 2
   prep

   For each; per (used with measurements).

   The car was only going twenty miles an hour.

Etymology tree Proto-Indo-European *ís? Proto-Indo-European *h₁óynos Proto-Germanic *ainaz Proto-West Germanic *ain Old English ān Middle English an English an From Middle English an, from Old English ān (“a, an”, literally “one”). More at one.

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