IPA: /ˌmʌl.tɪˈŋɡwɪ.li/
KK: /mʌlˈtɪŋɡwəli/
In a way that involves or uses multiple languages.
She speaks multilingually, switching between three languages in one conversation.
Multilingually → It is formed from "multi-" (meaning many) and "lingua" (from Latin, meaning tongue or language) and the suffix "-ly" (meaning in a manner of). The word "multilingually" means in a manner that involves many languages.
Think of 'multi-' meaning many and 'lingua' referring to language — this helps you remember that 'multilingually' means using many languages.