1.nounA unit of liquid capacity equal to two pints; one-fourth (quarter) of a gallon. Equivalent to 1.136 liters in the UK and 0.946 liter (liquid quart) or 1.101 liters (dry quart) in the U.S.
2.nounFour successive cards of the same suit.
3.nounA fourth; a quarter; hence, a region of the earth.