1. an ornament (such as a knot of ribbon or a rosette) usually worn on the hat;
The Collaborative International Dictionary of English v.0.48:
Cockade \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.
WordNet (r) 3.0 (2006):
n 1: an ornament (such as a knot of ribbon or a rosette) usually
worn on the hat