Etymology
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platoon (n.)

1630s, "a small body of soldiers acting together but separate from the main body of troops," from French peloton "platoon, group of people," literally "little ball" (15c.), hence, "agglomeration," diminutive of Old French pelote "ball" (see pellet). Football sense of "group of players trained to act as a unit on the field" is by 1941.

platoon (v.)

in baseball, "to alternate (a player) with another in the same position," 1967, from platoon (n.), which had been used in team sports since 1941.

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Definitions of platoon

platoon (n.)
a military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant;
platoon (n.)
a team of policemen working under the military platoon system;
platoon (n.)
a group of persons who are engaged in a common activity;
platoons of tourists poured out of the busses
the defensive platoon of the football team
From wordnet.princeton.edu