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say it: ahy-suh-LAY-shuh-nuhst
isolationist is a noun and adjective meaning "an advocate of isolationism in international affairs". It carries 2 recorded senses.
an advocate of isolationism in international affairs
of or relating to isolationism
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for isolationist come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.