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squad (n.)

1640s, "small number of military men detailed for some purpose," from French esquade, from French escadre, from Spanish escuadra or Italian squadra "battalion," literally "square," from Vulgar Latin *exquadra "to square," from Latin ex "out" (see ex-) + quadrare "make square," from quadrus "a square" (from PIE root *kwetwer- "four"). Before the widespread use of of automatic weapons, infantry troops tended to fight in a square formation to repel cavalry or superior forces. Extended to sports 1902, police work 1905.

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Definitions of squad from WordNet

squad (n.)
a smallest army unit;
squad (n.)
a cooperative unit (especially in sports);
Synonyms: team
squad (n.)
a small squad of policemen trained to deal with a particular kind of crime;
Synonyms: police squad
From wordnet.princeton.edu