thing-in-itself thing • thing-it-self · · · Info · Definitions · Synonyms · Characters · · thing-in-itself · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) the intellectual conception of a thing as it is in itself, not as it is known through perception. Synonyms: noumenon. · · Noun Definition 1 Synonyms · · · noumenon · · Synonym 1 Characters · · - hyphen-minus U+002D e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074