in·flec·tion inˈflekSH(ə)n/ noun noun: inflection; plural noun: inflections; noun: inflexion; plural noun: inflexions 1. GRAMMAR a change in the form of a word (typically the ending) to express a grammatical function or attribute such as tense, mood, person, number, case, and gender. synonyms: stress, cadence, rhythm, accent, intonation, pitch, emphasis, modulation, lilt, tone "when I read my lines, he'd gently correct my pronunciation and inflection" the process or practice of inflecting words. 2. the modulation of intonation or pitch in the voice. "she spoke slowly and without inflection" synonyms: stress, cadence, rhythm, accent, intonation, pitch, emphasis, modulation, lilt, tone "when I read my lines, he'd gently correct my pronunciation and inflection" the variation of the pitch of a musical note.