Etymology
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heathenism (n.)

c. 1600, from heathen + -ism. Old English words for it included hæðennes, hæðendom, and a later ones were heathenship (late Old English), heathenhood (late 13c.), heathenry (1560s).

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Definitions of heathenism

heathenism (n.)
any of various religions other than Christianity or Judaism or Islamism;
Synonyms: paganism / pagan religion
From wordnet.princeton.edu