Entry 1 sense Webster, 1913 Reentrant /(rē`ĕn"trant)/ · Re·en·trant · IPA /ɹiːˈɛntɹənt/ 01 a. Reentering; pointing or directed inwards; as, a reentrant angle. 1. Reentering; pointing or directed inwards; as, a reentrant angle.