re-entrant Syllabification: (re-en·trant)Pronunciation: /rē-ˈentrənt/Definition of re-entrant adjective (of an angle) pointing inward. The opposite of salient. having an inward-pointing angle or angles. noun 1a re-entrant angle. an indentation or depression in terrain. 2a person who has re-entered something, especially the labor force. re-entrant in other Oxford dictionaries Definition of re-entrant in the British & World English dictionary