n.1. A naval unit smaller than a fleet.
2. An armored cavalry unit subordinate to a regiment and consisting of two or more troops.
3. A cavalry or armored unit of a European army, corresponding to a company.
4. A basic tactical air force unit, subordinate to a group and consisting of two or more flights.
5. A multitude or horde: "Squadrons of flies like particles of dust danced up and down" (T.E. Lawrence).