many cultures; multiple cultures
Refers to the existence or presence of several distinct cultures, often in a societal context.
Many cultures coexist in this region.
noun which may take the genitive case particle 'no'
multicultural
Used adjectivally with の to describe something that involves or accommodates multiple cultures.
It is important to deepen multicultural understanding.
multiculturalism
Compound of 多 (た, 'many') and 文化 (ぶんか, 'culture'). A straightforward modern coinage.