Etymology
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gal (n.)

slang pronunciation of girl, 1795, originally noted as a vulgarism (in Benjamin Dearborn's "Columbian Grammar"). Compare gell, 19c. literary form of the Northern England dialectal variant of girl, also g'hal, the girlfriend of a b'hoy (1849). Gal Friday is 1940, in reference to "Robinson Crusoe."

updated on March 01, 2015

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Definitions of gal from WordNet

gal (n.)
United States liquid unit equal to 4 quarts or 3.785 liters;
Synonyms: gallon
gal (n.)
a unit of gravitational acceleration equal to one centimeter per second per second (named after Galileo);
gal (n.)
alliterative term for girl (or woman);
From wordnet.princeton.edu, not affiliated with etymonline.