expertise expert witness • expertism · · · Info · Definitions · Synonyms · Characters · · expertise · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) skillfulness by virtue of possessing special knowledge. Synonyms: expertness. · · Noun Definition 1 Synonyms · · · expertness · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 x latin small letter x U+0078