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quart (n.)

liquid measure of capacity equal to one-fourth of a gallon, early 14c., from Old French quarte "a fourth part" (13c.), from Latin quarta (pars), fem. of quartus "the fourth, fourth part" (related to quattuor "four," from PIE root *kwetwer- "four").

Compare Latin quartarius "fourth part," also the name of a small liquid measure (the fourth part of a sextarius), which was about the same as an English pint.

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Definitions of quart from WordNet

quart (n.)
a United States liquid unit equal to 32 fluid ounces; four quarts equal one gallon;
quart (n.)
a British imperial capacity measure (liquid or dry) equal to 2 pints or 1.136 liters;
quart (n.)
a United States dry unit equal to 2 pints or 67.2 cubic inches;
Synonyms: dry quart
From wordnet.princeton.edu