Announcement

google

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late 15th century: from French annoncer, from Latin annuntiare, from ad- ‘to’ + nuntiare ‘declare, announce’ (from nuntius ‘messenger’).

wiktionary

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announce +‎  -ment

etymonline

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announcement (n.)

1798, from French announcement, from Old French anoncier "announce, proclaim" (see announce). Or else formed in English from announce + -ment. Earlier in same sense was announcing.