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

able to communicate in two languages.

a person who speaks two languages fluently using or knowing two languages; "bilingual education" (bilingualism) the ability to speak two languages colloquially (bilingually) [..]

adj. Speaking two languages.

Inscribed in two languages. Most Canadian stamps include both English and French text. South African stamps from 1926-49 were printed alternately with English and Afrikaans inscriptions in the same sh [..]

Possessing knowledge of two languages; typically it refers to a person who can speak and write two languages.

The ability to use either one of two languages, especially when speaking. Biological Diversity:

or n

Bilingual students are those who function in more than one language in their daily lives. The term “bilingual” emphasises that students already have one language and that English is a second or additi [..]

In CLIL, a bilingual teaching context is where learners study curricular subjects in two languages: their native language and the additional language.

(n) a person who speaks two languages fluently(adj) using or knowing two languages

Equal ability to use two languages. (language, two, those who use it)

A learner who uses two or more languages to communicate and has access to more than one language at home and at school.

If used accurately, "bilingual" is a term is reserved for those speakers with native speaker proficiency in two languages and not merely those who speak two languages.