certain event

Noun

 * 1)  An event that contains all of the possible outcomes and thus is known a priori to be certain to occur;  the entire sample space (which by definition has measure 1 and probability 1); said sample space with the exclusion of, at most, a set of measure 0 (thus retaining measure 1).

Translations

 * Chinese:
 * Mandarin: 必然事件