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The Collaborative International Dictionary
Hetarism

Hetairism \He*tair"ism\, Hetarism \Het"a*rism\, n. [Gr. ? a companion, a concubine, fem. of ? a comrade.] A supposed primitive state of society, in which all the women of a tribe were held in common.
--H. Spencer. -- Het`a*ris"tic, a.

Wiktionary
hetarism

n. (alternative form of hetaerism English)