* Bilingual: This is the most common term and refers to someone who speaks two languages fluently.
* Multilingual: This term applies to someone who speaks more than two languages fluently.
* Polyglot: This term is less common but more sophisticated, and it also refers to someone who speaks multiple languages.
You can also use more informal terms like:
* Fluent in multiple languages
* Knows several languages
* Speaks more than one language
The best term to use depends on the context and the level of formality.