a prefix, a reduced form of the Old English preposition on, meaning `on', `in', `into', `to', `towards', preserved before a noun in a prepositional phrase, forming a predicative adjective or an adverbial element, as in afoot, abed, ashore, apart, aside, and in archaic and dialectal use before a present participle in -ing, as in to set the bells aringing.

{Middle English and late Old English a-, variant of Old English an, on at, on. See on}
a prefix, a reduced form of Old English of, as in akin, afresh, anew.

{Middle English a-, Old English of (preposition) off, of}
a prefix indicating

1. up, out, or away, as in arise, awake.
2. intensified action, as in abide, amaze.
{Middle English a-, up, out, away, from Old English ā, reduced form of ar-, or-, of Germanic origin}
variant of ab-1 before m, p, and v, as in amove, aperient, avert.

{Middle English a-, from French, from Latin ab-; or from Latin, reduced form of ab-. See ab-1}
variant of ad-, used

1. before sc, sp, st, as in ascend.
2. in words of French derivation, often with the sense of increase or addition, as in amass.
{Middle English a-, from French, from Latin ad-, or assimilated forms of ad-, such as ab-, ac-, af-, etc.; or from Latin, reduced form of ad- ad-}
a prefix meaning `not', `without', `lacking', used before consonants, as in achromatic, amoral.

Also, (before a vowel or h), an-. {Greek, before vowels an-, related to Latin in- not; compare English un-1}

Australian English dictionary. 2014.

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