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The Collaborative International Dictionary of English v.0.48 (gcide)

Insignia \In*sig"ni*a\, n. pl. [L. insigne, pl. insignia, fr.
insignis distinguished by a mark; pref. in- in signum a
mark, sign. See {Ensign}, {Sign}.]
[1913 Webster]
1. Distinguishing marks of authority, office, or honor;
badges; tokens; decorations; as, the insignia of royalty
or of an order.
[1913 Webster]

2. Typical and characteristic marks or signs, by which
anything is known or distinguished; as, the insignia of a
trade.
[1913 Webster]