exclusionismn.
/ɛkˈskluːʒənɪz(ə)m/ The character, manner, or principles of an exclusionist; exclusivism.
ΚΠ
1846 J. E. Worcester Universal Dict. Eng. Lang. (citing Chr. Observer).
1864 in Webster's Amer. Dict. Eng. Lang. ; hence in later Dicts.
This entry has not yet been fully updated (first published 1894; most recently modified version published online September 2021).
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n.1846