Entry 1 sense Webster, 1913 Adiaphoristic /(ăd`ĭ*ăf`ō̇*rĭs"tĭk)/ · Ad·i·aph·o·ris·tic · IPA 01 a. Pertaining to matters indifferent in faith and practice. 1. Pertaining to matters indifferent in faith and practice.