From The Collaborative International Dictionary of English v.0.48:
Troop \Troop\, n. [F. troupe, OF. trope, trupe, LL. troppus; of
uncertain origin; cf. Icel. [thorn]orp a hamlet, village, G.
dorf a village, dial. G. dorf a meeting. Norw. torp a little
farm, a crowd, E. thorp. Cf. Troupe.]
1. A collection of people; a company; a number; a multitude.
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That which should accompany old age
As honor, love, obedience, troops of friends
I must not look to have. --Shak.
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2. Soldiers, collectively; an army; -- now generally used in
the plural.
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Farewell the plumed troop, and the big wars. --Shak.
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His troops moved to victory with the precision of
machines. --Macaulay.
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3. (Mil.) 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.
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4. A company of stageplayers; a troupe. --W. Coxe.
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5. (Mil.) A particular roll of the drum; a quick march.
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6. See Boy scout, above.
[Webster 1913 Suppl.]
From The Collaborative International Dictionary of English v.0.48:
Troop \Troop\, v. i. [imp. & p. p. Trooped; p. pr. & vb. n.
Trooping.]
1. To move in numbers; to come or gather in crowds or troops.
"Armies . . . troop to their standard." --Milton.
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2. To march on; to go forward in haste.
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Nor do I, as an enemy to peace,
Troop in the throngs of military men. --Shak.
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From The Collaborative International Dictionary of English v.0.48:
Troop \Troop\, v. t.
To troop the colors or To troop the colours (Mil.),
in the British army, to perform a ceremony consisting
essentially in carrying the colors, accompanied by the band
and escort, slowly before the troops drawn up in single file
and usually in a hollow square, as in London on the
sovereign's birthday.
[Webster 1913 Suppl.]