EXPERTISE Definition Meaning - Merriam-Webster The meaning of EXPERTISE is the skill of an expert How to use expertise in a sentence the skill of an expert; expert opinion or commentary… See the full definition Games; Word of the Day; Grammar; Wordplay; Slang; Rhymes; Word Finder; Thesaurus; Join MWU; More Games; Word of the Day; Grammar; Wordplay; Slang; Rhymes;