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qt.

1.
2.
plural qt. qts. quart.

q.t.

Informal.
1.
Idioms
2.
on the q.t., stealthily; secretly:
to meet someone on the q.t.
Also, Q.T.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for qt

qt

abbreviation (pl) qt, qts
1.
quart

q.t.

abbreviation (informal)
1.
quiet
2.
on the q.t., secretly
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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Word Origin and History for qt

q.t.

n.

slang for "quiet," in phrase on the q.t., attested from 1874. Phrase on the quiet appears from 1847.

Online Etymology Dictionary, © 2010 Douglas Harper
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qt in Medicine

qt or qt.
abbr.
quart

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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qt in Science
qt.  
Abbreviation of quart
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for qt

QT

cutie

qt

quart

q.t.

quiet

Q.T.

Latin qui tam (who sues)
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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Idioms and Phrases with qt

Q.T.

The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for qt

quart

unit of capacity in the British Imperial and U.S. Customary systems of measurement. For both liquid and dry measure, the British system uses one standard quart, which is equal to two imperial pints, or one-fourth imperial gallon (69.36 cubic inches, or 1,136.52 cubic cm). The U.S. system has two units called a quart, one for liquid measure and a slightly larger unit for dry measure. The U.S. liquid quart is equal to two liquid pints, or one-fourth U.S. gallon (57.75 cubic inches, or 946.35 cubic cm); and the dry quart is equal to two dry pints, or 132 bushel (67.2 cubic inches, or 1,101.22 cubic cm).

Learn more about quart with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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