Entry 1 sense Webster, 1913 obiter dictum /(ŏb"ĭ*tẽr dĭk"tŭm)/ · IPA /ˌoʊbɪɾɚ ˈdɪktəm/ 01 n. An incidental and collateral opinion uttered by a judge. See Dictum, n., 2 (a). pl. obiter dicta ((ŏb"ĭ*tẽr dĭk"tȧ)) 1. An incidental and collateral opinion uttered by a judge. See Dictum, n., 2 (a).(Law) See: Dictum