<p><strong>Noun</strong></p><ul><li>a person who has special skill or knowledge in some particular field; specialist; authority: a language expert.</li><li>Synonyms: master, connoisseur.</li><li>Military: the highest rating in rifle marksmanship, above that of marksman and sharpshooter.</li><li>a person who has achieved such a rating.</li></ul><p><strong>Adjective</strong></p><ul><li>possessing special skill or knowledge; trained by practice; skillful or skilled (often followed by in or at): an expert driver; to be expert at driving a car.</li><li>Synonyms: dexterous, proficient, experienced.</li><li>Antonyms: unskillful.</li><li>pertaining to, coming from, or characteristic of an expert: expert work; expert advice.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to act as an expert for.</li></ul>