Etymology
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regalia (n.)

1530s, "rights and powers of a king, royal privilege," from Latin regalia "royal things," noun use of neuter plural of regalis from rex (genitive regis) "king" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule").

The meaning "decorations or insignia of an order" is recorded from 1670s, probably via the sense of "the emblems or insignia of royalty," e.g. the crown, scepter, etc. (1620s).

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Definitions of regalia

regalia (n.)
paraphernalia indicative of royalty (or other high office);
regalia (n.)
especially fine or decorative clothing;
Synonyms: array / raiment
From wordnet.princeton.edu