Having had experience; experienced; practised; trained; taught by use, practice, or experience.Skilful; dexterous; adroit; having facility acquired by practice.Pertaining to or resulting from experience; due to or proceeding from one having practical knowledge or skill: as, expert workmanship; expert testimony.Synonyms Adroit, Dexterous, Expert, etc. (see adroit); trained, practised. See skilful.n. An experienced, skilful, or practised person; one skilled or thoroughly informed in any particular department of knowledge or art.n. In law, a person who, by virtue of special acquired knowledge or experience on a subject, presumably not within the knowledge of men generally, may testify in a court of justice to matters of opinion thereon, as distinguished from ordinary witnesses, who can in general testify only to facts.To experience.[⟨ expert, n.] To examine (books, accounts, etc.) as an expert; have examined by an expert: as, the accounts have been experted.