noun, plural libidos.
Psychoanalysis. all of the instinctual energies and desires that are derived from the id.
sexual instinct or sexual drive.

1890–95; < Latin libīdō desire, willfulness, lust, akin to libēre to be pleasing

libidinal [li-bid-n-l] , adjective
libidinally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
libido (lɪˈbiːdəʊ)
n , pl -dos
1.  psychoanal psychic energy emanating from the id
2.  sexual urge or desire
[C20 (in psychoanalysis): from Latin: desire]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"psychic drive or energy, usually associated with sexual instinct," 1892, carried over untranslated in Eng. edition of Krafft-Ebing's "Psychopathia Sexualis"; 1909 in A.A. Brill's translation of Freud's "Selected Papers on Hysteria" (Freud's use of the term led to its popularity); from L. libido "desire,
lust," from libere "to be pleasing, to please," ultimately cognate with O.E. lufu (see love).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

libido li·bi·do (lĭ-bē'dō, -bī'-)
n. pl. li·bi·dos

  1. The psychic and emotional energy associated with instinctual biological drives.

  2. Sexual desire.

  3. Manifestation of the sexual drive.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
libido [(luh-bee-doh)]

In Freudian psychology, the energy associated with the desires that come from the id.

Note: Libido is loosely used to mean sexual desire.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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