a.c. d.c

AC/DC

Electricity.
alternating current or direct current.
Also, A.C./D.C., ac/dc, a-c/d-c, a.c.-d.c.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
AC/DC
 
—adj
informal (of a person) bisexual
 
[C20: humorous reference to electrical apparatus that is adaptable for alternating current and direct current]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
A.c. d.c is always a great word to know.
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a chattering or flighty, light-headed person.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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Etymonline
Word Origin & History

AC/DC
"bisexual," 1959, said to have been in use orally from c.1940, from electronics abbreviation of alternating current/direct current.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
AC/DC

  1. alternating current/direct current

  2. bisexual

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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