Definition of a- in English:

a-1

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

prefix

  • Not; without: atheistic acephalous

Origin

from Greek.

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Definition of a- in:

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space