Etymology
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squadron (n.)

1560s, from Italian squadrone, augmentative of squadra "battalion," literally "square" (see squad). As a division of a fleet, from 1580s, of an air force, 1912.

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Definitions of squadron

squadron (n.)
a cavalry unit consisting of two or more troops and headquarters and supporting arms;
squadron (n.)
an air force unit larger than a flight and smaller than a group;
squadron (n.)
a naval unit that is detached from the fleet for a particular task;
From wordnet.princeton.edu