Meaning of AN in English

AN

I. ən, (ˈ)an indefinite article

Etymology: Middle English, from Old English ān one — more at one

Date: before 12th century

: a II

Usage: see a II

II. ən, an preposition

Date: before 12th century

: a III,2

Usage: see a II

III. conjunction

or an'

Date: 12th century

1. see and : and

2. ˈan archaic : if

IV. abbreviation

Etymology: Latin annum; annus

year

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.