A friend from Africa says that there, it is customary to speak the language of the person you are conversing with. For example if my native language is English and yours is French, then I would talk to you in French and you would talk to me in English. She said most people could speak 25 or more languages. Not dialects, but distinct languages. Boggles my mind.

She also says;
Speaks three languages = Tri-lingual.
Speaks two language = Bi-lingual
Speaks one language = American.