This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or pertaining to collectivism

Pertaining or related to or accordant with collectivism.

adj. subscribing to the socialistic doctrine of ownership by the people collectively

"The prevalence of the large corporation, with its shift of power from the owners to the managers has certainly changed the character of modern capitalism from an individualistic to a "collectivistic" system."

socialistic    socialist