What is the proper name for four-lingual?

There isn't a single, universally accepted term for someone who speaks four languages. Here are some options:

* Quadrilingual: This is the most common and technically accurate term, derived from the Latin "quadri" meaning four.

* Tetra-lingual: Another option, also derived from the Greek "tetra" meaning four.

* Four-language speaker: This is a simple and straightforward description.

* Polyglot: This term refers to someone who speaks multiple languages, but it doesn't specify the number.

Ultimately, the best choice depends on the context and your personal preference.