English
evential
From event + -ial.
Formed from event + -ial
Proto-Indo-European *gʷem- ‘to come’
…
Latin veniō ‘come’
Latin ēveniō ‘to happen’
Latin ēventus ‘an event’
Middle French event
English event
Today it means
adj Pertaining to or composed of events.
Language periods are conventional ranges, not dates for this word.
Etymograph / evential