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breckenridgeback t1_ja5cv5b wrote

They're from different languages.

a- meaning not is from Greek, and is usually attached to other Greek roots: atheist (from Greek theo "god" as opposed to Latin deus), anoxic ("oxygen" is from Gree roots), etc.

ab- meaning "away from" (as in a direction, the opposite of "towards") is Latin, and is usually attached to other Latin roots.

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