Entry 1 sense Webster, 1913 Innermost /(ĭn"nẽr*mōst`)/ · In·ner·most · IPA /ˈɪnɚmoʊst/ 01 a. Farthest inward; most remote from the outward part; inmost; deepest within. 1. Farthest inward; most remote from the outward part; inmost; deepest within.