(a.) Speaking two languages; expressed in two languages; as, a bilingual inscription; a bilingual dictionary\.

bilingual dialectician diglot etymologer etymologist glossarist glossographer grammarian grammaticaster grammatist lexicographer lexicologist linguistic scholar linguistic scientist linguistician multilingual orthoepist paleographer philologaster philologer philologian philologist phonemicist phonetician phoneticist phonologist polyglot semanticist semasiologist