ab-

I.
a prefix meaning `off', `away', `from', as in abduct, abjure.

{Latin, representing ab (preposition) from, away; related to Greek apo from}
II.
a prefix attached to practical electric units, indicating a centimetre-gram-second electromagnetic unit of measurement: an abvolt is equivalent to 10-8 volts.

{abbreviation of absolute}

Australian English dictionary. 2014.

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