Past tense of 'glory,' meaning to take great pride or pleasure in something, or to exult boastfully.
From 'glory' (noun) used as a verb, with '-ed' past tense ending. The verb form developed from the noun in Middle English, following the common pattern of turning nouns into verbs.
Shakespeare used 'gloried' to describe characters taking arrogant pride in their achievements—it carries a subtle note of excessive or undeserved pride that the plain word 'celebrated' doesn't quite capture.
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