\Cock*ade"\, n. [F. cocarble, fr. coquard vain, OF.
coquart, fr. coq cock, prob. of imitative origin. The
ornament is so named from its resemblance to the crest of a
cock. Cf. {Coquette}.]
A badge, usually in the form of a rosette, or knot, and
generally worn upon the hat; -- used as an indication of
military or naval service, or party allegiance, and in
England as a part of the livery to indicate that the wearer
is the servant of a military or naval officer.

      Seduced by military liveries and cockades. --Burke.