Etymology
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bilingual (adj.)

1818, "speaking two languages;" 1825, "expressed in two languages;" see bi- "two" + lingual. Latin bilinguis meant literally "two-tongued," and, figuratively, "speaking a jumble of languages," also "double-tongued, hypocritical, false."

updated on May 29, 2017

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Definitions of bilingual from WordNet
1
bilingual (n.)
a person who speaks two languages fluently;
Synonyms: bilingualist
2
bilingual (adj.)
using or knowing two languages;
bilingual education
From wordnet.princeton.edu, not affiliated with etymonline.