Past tense of eventuate; finally happened or resulted in a particular outcome.
From 'eventuate' plus the regular past tense suffix '-ed.' Standard English verb conjugation from the 17th century onward.
Regular verbs like 'eventuate' just add '-ed' for past tense, which is why most English verbs are predictable—but the dozen or so irregular verbs (be, go, have, do) are the most common words, suggesting irregular verbs are 'grandfather clauses' in language that never got updated!
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