Present participle of eventuate; the process of finally happening or resulting.
From 'eventuate' plus the present participle suffix '-ing.' Standard English verb form used in continuous tenses since Middle English.
The '-ing' form of verbs is linguistically fascinating because it can function as a noun ('eventuating is interesting'), a verb ('she is eventuating'), or an adjective ('an eventuating crisis'), giving English incredible flexibility for complex thoughts.
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