Monolingual

[mɒnə(ʊ)'lɪŋgw(ə)l] or [,mɑnə'lɪŋɡwəl]

Definition

(noun.) a person who knows only one language.

(adj.) using or knowing only one language; 'monolingual speakers'; 'a monolingual dictionary' .

Edited by Anselm--From WordNet