IPA: //ˈpɒlɪˌɡlɒtɪzəm//
KK: /ˈpɑlɪˌɡlɑtɪzəm/
The ability to speak and understand multiple languages fluently.
Her polyglottism allows her to communicate with people from different countries effortlessly.
Polyglottism → It is formed from "poly-" (from Greek "polus", meaning many) and "glotta" (from Greek, meaning tongue or language) and the suffix "-ism" (meaning a practice or belief). The word describes the practice or belief of knowing or using many languages.
Think of 'many' ('poly-') languages ('glotta') being spoken — that's what polyglottism means.