'Squadron' definitions:

Definition of 'squadron'

noun

A cavalry unit consisting of two or more troops and headquarters and supporting arms

noun

An air force unit larger than a flight and smaller than a group

noun

A naval unit that is detached from the fleet for a particular task

From: GCIDE

Squadron \Squad"ron\ (skw[o^]d"r[u^]n), n. [F. escadron, formerly also esquadron, Sp. escuadron, or It. squadrone. See Squad.]
1. Primarily, a square; hence, a square body of troops; a body of troops drawn up in a square. [R.] [1913 Webster]
Those half-rounding quards Just met, and, closing, stood in squadron joined. --Milton. [1913 Webster]
2. (Mil.) A body of cavalry comprising two companies or troops, and averaging from one hundred and twenty to two hundred men. [1913 Webster]
3. (Naut.) A detachment of vessels employed on any particular service or station, under the command of the senior officer; as, the North Atlantic Squadron. --Totten. [1913 Webster]
Flying squadron, a squadron of observation or practice, that cruises rapidly about from place to place. --Ham. Nav. Encyc. [1913 Webster]