(taxonomy) a moment when the evolutional lineage splits, starting history of a new species.

(medicine) Any unanticipated or unusual event in a medical setting which results in death or serious physical injury to a person or persons, specifically including limb loss or gross motor function.

plural of event horizon

An event in which doujin circles gather to sell fan-made (doujin) works. Example: Comic Market.

plural of field event

(euphemistic, astronautics, engineering) An explosion.

plural of event loop

(computing) programming construct that waits for and dispatches events or messages in a program

plural of event handler

(computing) A method or subroutine that handles an event.