Entry 2 senses · 2 variants Webster, 1913 Septentrion · Sep·ten·tri·on · IPA n. a. 01 n. The north or northern regions. 1. The north or northern regions. “Both East West, South and Septentrioun.” — Chaucer. 02 a. Of or pertaining to the north; northern. 1. Of or pertaining to the north; northern.