Refers to an ideology or attitude that seeks to exclude certain groups, ideas, or influences. Often used in political, social, or religious contexts.
The party's exclusionist policies drew criticism.
排除主義は多様性を認めない考え方だ。
Exclusionism is a way of thinking that does not accept diversity.
Compound of 排除 (exclusion) + 主義 (principle, -ism). The exact historical derivation is uncertain, but it follows the standard pattern for forming ideological terms in modern Japanese.