(informal, chiefly law) In the event that the thing being discussed comes to pass.

(philosophy) Existence at a particular point in time.

plural of when

(UK) as soon as

Contraction of when is. / (informal) Contraction of when has. / (informal) Contraction of when does. / (colloquial) Contraction of when was.

Alternative form of whenas

At (or as soon as) that time that; at the (or any and every) time that; if. / During the time that; at the time of the action of the following clause or participle phrase. / At what time; at which time.

(interrogative) What time; which time.

The time at which something happens.

(often humorous) That's enough: a command asking someone to stop adding something, especially an ingredient or portion of food or drink; used in, or as if in, literal response to 'Say when'.