WordReference Random House Unabridged Dictionary of American English © 2025
ex•pan•sion•ism
(ik span′shə niz′əm),USA pronunciation n.
ex•pan′sion•ist, n., adj.
ex•pan′sion•is′tic, adj.
- Government, World Historya policy of expansion, as of territory or currency:the colonial expansionism of Europe in the 19th century.
- expansion + -ism 1895–1900
ex•pan′sion•is′tic, adj.
'expansionist' also found in these entries (note: many are not synonyms or translations):