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From Biology-Online Dictionary
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1. (Science: prefix) a prefix meaning from or away from, off.

2. Applied to electrical units in the CGS-electromagnetic system to distinguish them from units in the CGS-electrostatic system (prefix stat-) and those in the metric system or si system (no prefix).

Origin: L. Ab, from, usually abs-before c, q, and t; often a-before m, p, or v