Polyglottic is a term commonly used to describe someone who is fluent in multiple languages. However, there are several other synonyms that can be used to describe such a person with similar meanings. Multilingual, polylingual, and linguistically skilled are some common alternatives to polyglottic. Additionally, someone who has advanced proficiency in several languages could be referred to as a polyglot, language expert, or linguist. It is important to note that the term polyglottic is often used in academic and technical writing, while other synonyms may be more appropriate for casual conversation or everyday use.