The time interval between the instant of the occurrence of a specified input condition to a system and the instant of completion of a specified operation.

(idiomatic, sarcastic) Used to express impatience at the eventual occurrence of something that the speaker or writer considered to be long overdue.

(chiefly science fiction) Hypothetical or fictional travel to the past or the future, typically by means of a machine (a time machine) or a wormhole.

One who engages in time travel.

(chiefly science fiction) A hypothetical device used to travel into the past or the future.

(idiomatic) At the last possible moment; at the last minute.

Alternative spelling of lifetime

Tested and proved to be reliable over a period of time.

(idiomatic) Even under the most favourable conditions.

(Christianity) The days leading up to the second coming of the Messiah (Christ), when the world will be judged. / (Islam) The days leading to the coming of the Mahdi.