AD
(medicine) Alzheimer's disease
(mathematics) average deviation
time [Anno Domini, i.e. ‘the year of the Lord’] The label prefixed to the number of a year, e.g. AD 500, but see CE.
abbr.active duty.
See the Introduction, Abbreviations and Pronunciation for further details.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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Oxford Dictionary of Units & Measures
A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.
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