Entry 1 sense Webster, 1913 Mispronunciation /mĭsprə-nŭn'-sē-ā′-shən/ · Mis·pro·nun·ci·a·tion · IPA /mɪspɹəˌnʌn.siˈeɪ.ʃən/ 01 n. Wrong or improper pronunciation. 1. Wrong or improper pronunciation.