To convert something into common ownership or to organize something according to communist principles, especially in British English spelling.
From commune (Latin communis, 'common') + -ise suffix. The verb emerged in the 19th century as communist ideology developed, with -ise being the British spelling variant of -ize.
The choice between 'communise' and 'communize' reveals how British English retained the -ise ending while American English preferred -ize, a spelling split that happened across hundreds of verbs during the Industrial Revolution when these political movements were exploding.
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