In multilingual texts and audio speeches, verbal content is expressed in several, more than one, languages.
Languages are methods and systems of communication.
Multilingualism is the use of more than one language, either by an individual speaker or by a group of speakers. People who speak multiple languages are called polyglots.
Multilingual speakers have acquired and maintained at least one language during childhood. Children acquiring two languages natively from early years are called simultaneous bilinguals.