Definition of a- in English:

a-

Pronunciation: /ə, eɪ, a/
(often an- before a vowel)

prefix

Not; without: atheistic acephalous

Origin

from Greek.

Definition of a- in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous