■ noun
1》 an operational unit in an air force consisting of two or more flights of aircraft.
2》 a principal division of an armoured or cavalry regiment, consisting of two or more troops.
3》 a group of warships detached on a particular duty or under the command of a flag officer.
Origin
C16 (orig. denoting a group of soldiers in square formation): from Ital. ~e , from squadra 'square'.