Entry 3 senses · 2 variants Webster, 1913 Tonight /tən-īt'/ · To·night · IPA /təˈnaɪt/ adv. n. 01 adv. On this present or coming night. 1. On this present or coming night. 2. On the last night past.[Obs.] 02 n. The present or the coming night; the night after the present day. 1. The present or the coming night; the night after the present day.