Entry 1 sense Webster, 1913 Postponement /pōs-tpōn'-mənt/ · Post·pone·ment · IPA /poʊstpˈoʊnmənt/ 01 n. The act of postponing; a deferring, or putting off, to a future time; a temporary delay. 1. The act of postponing; a deferring, or putting off, to a future time; a temporary delay.