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ab-

1.
a formal element occurring in loanwords from Latin, where it meant “away from”:
abdicate; abolition.
Also, a-, abs-.
Origin
< Latin ab (preposition and prefix) from, away, cognate with Greek apó, Sanskrit ápa, German ab, English of1, off
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ab-

ab-1

prefix
1.
away from; off; outside of; opposite to: abnormal, abaxial, aboral
Word Origin
from Latin ab away from

ab-2

prefix
1.
denoting a cgs unit of measurement in the electromagnetic system: abvolt
Word Origin
abstracted from absolute
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ab-

word-forming element meaning "away, from, from off, down;" from Latin ab-, ab "off, away from," from PIE root *apo- (see apo-). Reduced to a- before -m-, -p-, or -v-; sometimes abs- before -c- or -t-.

Online Etymology Dictionary, © 2010 Douglas Harper
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ab- in Medicine

ab- 1
pref.
Away from: abaxial.

ab- 2
pref.
Used to indicate an electromagnetic unit in the centimeter-gram-second system: abcoulomb.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Difficulty index for ab-

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Word Value for ab

4
0
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