simple past tense and past participle of prolong

lengthy in duration; extended; protracted.

(transitive) To extend in space or length. / (transitive) To lengthen in time; to extend the duration of / (transitive) To put off to a distant time; to postpone.

prolongation

present participle of prolong

Capable of being prolonged, extended, or lengthened.

The act of prolonging, or the state of being prolonged; prolongation.

One who or that which prolongs, or lengthens in time or space.

The act of prolonging. / That which has been prolonged; an extension.

plural of prolongation