To announce something publicly and officially, usually with confidence or certainty.
From Latin 'proclamare' (pro- 'forth' + clamare 'to cry'), originally meaning to cry out in public. The word evolved through Old French into Middle English, retaining its sense of public declaration.
Medieval town criers used to 'proclaim' news by literally shouting from the town square—the word's history is preserved in the modern meaning of making official public announcements.
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