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The Collaborative International Dictionary
Gentilism

Gentilism \Gen"til*ism\, n. [Cf. F. gentilisme.]

  1. Hethenism; paganism; the worship of false gods.

  2. Tribal feeling; devotion to one's gens.

Wiktionary
gentilism

n. 1 heathenism; paganism; the worship of false gods 2 tribal feeling; devotion to one's gens