I suppose the prefix "bi-" means "two". Then, what would be an appropriate term if you could speak more than three languages?
A trilingual is a person who speaks three languages, and a person who speaks four languages is a quadrilingual (someone who can speak four or more languages is also simply called "multilingual"). Someone who speaks five or more languages is multilingual or a polyglot, and if someone is able to speak 12 languages or more, they are a hyperpolyglot. Ex: I can speak four languages. I am considered multilingual. Ex: Most civil servants working in the foreign ministry are at least bilingual. Some are even trilingual or multilingual.
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