Multiculturalism is the idea that a broad variety of different cultures can co-exist in the same social framework. In order for this to work, everyone must have a high level of tolerance, and there must be certain agreed-upon and basic limits to what actions you can justify with culture which all of the cultures accept. The limits are generally at the point where your culture permits significant incursion on the freedom and dignity of others. For example, even if your culture permits human sacrifice, that will almost certainly be considered to be beyond the limits.
a mix of different cultures, i think....