To finally happen or occur as a result of something; to work out or turn out in the end.
From Latin 'eventuari' (to issue in a result) via 'eventual.' Adopted into English in the 17th century, meaning 'to come to pass ultimately.'
Eventuate is a fancy synonym for 'happen,' but it specifically implies that something was uncertain until the end—'The plan eventuated as hoped' sounds better than 'The plan happened' because it emphasizes that we didn't know for sure it would work out.
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