Meaning of A- in English

A-

I. ə prefix

Etymology: Middle English, from Old English

1. : on : in : at

a bed

2. : in (such) a state or condition

a fire

3. : in (such) a manner

a loud

4. : in the act or process of

gone a- hunting

a tingle

II. (ˈ)ā also (ˈ)a or (ˈ)ä prefix

or an- (ˈ)an

Etymology: Latin & Greek; Latin, from Greek — more at un-

: not : without

a sexual

— a- before consonants other than h and sometimes even before h, an- before vowels and usually before h

a chromatic

a historical

an astigmatic

an hydrous

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