Entry 2 senses · 2 variants Webster, 1913 Missy /mĭs'-ē/ · Mis·sy · IPA /ˈmɪs.i/ n. n. 01 n. See Misy. 1. See Misy.(Min.) See: Misy 02 n. An affectionate, or contemptuous, form of miss; a young girl; a miss. 1. An affectionate, or contemptuous, form of miss; a young girl; a miss.