What do a.m. and p.m. stand for?


[am-peer-ouuh r, -ou-er, am-peer-] /ˈæm pɪərˈaʊər, -ˈaʊ ər, æmˈpɪər-/
noun, Electricity
a unit of electric charge noting the amount of electricity transferred by a current of one ampere in one hour, equal to 3600 coulombs.
Abbreviation: Ah, amp-hr, amp. hr.
Origin of ampere-hour
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ampere-hour
  • Facilities shall maintain monthly records of total ampere-hour use per calendar year.
  • The ampere-hour capacity of weak cells greatly decreases.
British Dictionary definitions for ampere-hour


a practical unit of quantity of electricity; the quantity that flows in one hour through a conductor carrying a current of 1 ampere. 1 ampere-hour is equivalent to 3600 coulombs a.h.
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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