|an1 (æn, (unstressed) ən)|
|a form of the indefinite article used before an initial vowel sound: an old car; an elf; an honour|
|usage An was formerly often used before words that begin with h and are unstressed on the first syllable: an hotel; an historic meeting. Sometimes the initial h was not pronounced. This usage is now becoming obsolete|
|—the internet domain name for|
|—the chemical symbol for|
Variant of a-.