What does "monoculturalism" mean?

The practice of maintaining, in a society, a single culture, suppressing the (sub)cultures of e.g. minority groups and excluding external influences.

Monoculturalism

noun

noun ·Rare ·Advanced level

Noun

1
The practice of maintaining, in a society, a single culture, suppressing the (sub)cultures of e.g. minority groups and excluding external influences. countable, uncountable
2
The creation of a monoculture in agriculture. countable, uncountable

"There has never been monoculturalism without oppression."

From monocultural + -ism.