Definition of troop

• n. - A collection of people; a company; a number; a multitude.
• n. - Soldiers, collectively; an army; -- now generally used in the plural.
• n. - Specifically, a small body of cavalry, light horse, or dragoons, consisting usually of about sixty men, commanded by a captain; the unit of formation of cavalry, corresponding to the company in infantry. Formerly, also, a company of horse artillery; a battery.
• n. - A company of stageplayers; a troupe.
• n. - A particular roll of the drum; a quick march.
• v. i. - To move in numbers; to come or gather in crowds or troops.
• v. i. - To march on; to go forward in haste.