IPA: /ˌmʌltiˈkʌltʃərəl/
KK: /mʌltiˈkʌltʃərəl/
Relating to or including multiple cultures, often promoting understanding and appreciation of different cultural backgrounds within a society.
The school has a multicultural program that celebrates various traditions and languages.
Multicultural is formed from "multi-" (meaning many) and "cultura" (from Latin, meaning cultivation or culture). The word describes a society that encompasses many different cultures.
Think of 'many' ('multi-') different 'cultures' ('cultura') coming together — that's what multicultural means.