quid

1 [kwid]
noun
a portion of something, especially tobacco, that is to be chewed but not swallowed.

Origin:
1720–30; dialectal variant of cud

Dictionary.com Unabridged

quid

2 [kwid]
noun, plural quid.
British Informal. one pound sterling.

Origin:
1680–90; origin uncertain

quid pro quo

[kwid proh kwoh]
noun, plural quid pro quos, quids pro quo for 2.
1.
(italics) Latin. one thing in return for another.
2.
something that is given or taken in return for something else; substitute.

Origin:
1555–65; Latin quid prō quō literally, something for something; see what, pro1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quid1 (kwɪd)
 
n
a piece of tobacco, suitable for chewing
 
[Old English cwidu chewing resin; related to Old High German quiti glue, Old Norse kvātha resin; see cud]

quid2 (kwɪd)
 
n , pl quid
1.  slang (Brit) one pound sterling
2.  slang (Brit) quids in in a very favourable or advantageous position
3.  slang (Austral), (NZ) not the full quid mentally subnormal
 
[C17: of obscure origin]

quid pro quo (ˈkwɪd prəʊ ˈkwəʊ)
 
n , pl quid pro quos
1.  a reciprocal exchange
2.  something given in compensation, esp an advantage or object given in exchange for another
 
[C16: from Latin: something for something]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

quid
"bite-sized piece" (of tobacco, etc.), 1727, dial. variant of M.E. cudde, from O.E. cudu, cwidu (see cud).

quid
"one pound sterling," 1688, British slang, possibly from quid "that which is" (1606, see quiddity), as used in quid pro quo (q.v.).

quid pro quo
1565, from L., lit. "something for something, one thing for another."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
quid pro quo [(kwid proh kwoh)]

A fair exchange; the phrase is most frequently used in diplomacy: “The Chinese may make some concessions on trade, but they will no doubt demand a quid pro quo, so we must be prepared to make concessions too.” From Latin, meaning “something for something.”

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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Example sentences
He and the university both denied any quid pro quo in his hiring.
The album details his quest to find a thousand quid that's gone missing.
The myth of absolute rule aside, prison administrators have always practiced a
  form of quid pro quo to keep order.
Miller's computer in which he offered the quid pro quo.
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