Meaning

noun a person with special knowledge or ability who performs skillfully

adjective having or showing knowledge and skill and aptitude

adjective of or relating to or requiring special knowledge to be understood

originInherited from Middle English expert, derived from Old French expert (“experienced”), espert, from Latin expertus (contracted from *experitus), perfect active participle of experior (“to try”), from ex- + *-perior.

Etymology from Wiktionary, CC BY-SA 3.0