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"one-fourth of a gallon," early 14c., from Old French quarte "a fourth part" (13c.), from Latin quarta (pars), from fem. of quartus "the fourth," related to quattuor "four," from PIE root *kewtwor- (see four). Cf. 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.
Abbr. q., qt, qt.
A unit of volume or capacity in the U.S. Customary System, used in liquid measure, equal to 2 pints or 32 ounces (0.946 liter).
A unit of volume or capacity in the U.S. Customary System, used in dry measure, equal to 1.101 liters.
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).