Multilingualism

Multilingualism is the ability to fluently speak two or more languages. This sometimes, but does not always, overlap with Language Decipherment.

Fluency, is defined by "Although there are no widely agreed-upon definitions or measures of language fluency, someone is typically said to be fluent if their use of the language appears fluid, or natural, coherent, and easy as opposed to slow, halting use. In other words, fluency is often described as the ability to produce language on demand and be understood.", this is to say, their use of the language is quick, automatic, and coherent, wherein the user can manage all of the components of language use without paying attention to each individual component of the act.

As long as they fulfill the requirements for fluency, a common usage of code-switching, defined as "the practice of alternating between two or more languages or varieties of language in context of a single conversation or situation", is not enough to disqualify one from Multilingualism. As it does not inherently display a lack of fluency.

This does not apply to characters who are only capable of speaking multiple languages through a form of Language Decipherment, nor does it apply to characters who can only understand a small or rudimentary amount of a language, true fluency is required. This is with the exception of Language Decipherment Types 2 or 3, which is considered to constitute for true fluency. Type 4 can also apply, depending on context.