bi·lin·gual 
(bī-lĭnggwəl)
(bī-lĭnggwəl)adj.
1.
a. Using or able to use two languages, especially with equal or nearly equal fluency.
b. Using two languages in some proportion in order to facilitate learning by students who have a native proficiency in one language and are acquiring proficiency in the other: bilingual training; bilingual education.
2. Of, relating to, or expressed in two languages: a bilingual dictionary.
n.
A person who uses or is able to use two languages, especially with equal fluency.
bi·lingual·ism n.
bi·lingual·ly adv.