prefix 1 from, away (abridge). 2 of (akin; anew). 3 out, utterly (abash; affray). 4 in, on, engaged in, etc. (see A(2)).
[ sense 1 f. ME a-, OF a-, f. L ab; sense 2 f. ME a- f. OE of prep.; sense 3 f. ME, AF a- = OF e-, es- f. L ex ]
A
Meaning of A in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012