Entry 1 sense Webster, 1913 Retroflexion · Re·tro·flex·ion · IPA /ˌɹɛtɹəˈflɛk.ʃən/ 01 n. The act of reflexing; the state of being retroflexed. Cf. Retroversion. 1. The act of reflexing; the state of being retroflexed. Cf. Retroversion. See: Retroversion