plural of impossible event

(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set.

(probability theory) An event that contains all of the possible outcomes and thus is known a priori to be certain to occur; the entire sample space.

plural of certain event

Alternative form of in any event

(chemistry) A period of time when large expanses ocean are depleted of dissolved oxygen.

(astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light. / (by extension) A point of no return.

Current affairs; those events and issues of interest currently found in the news.

plural of event horizon

(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.