Etymology
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ism (n.)

"distinctive doctrine, theory, or practice," 1670s, the suffix -ism used as an independent word, chiefly disparagingly. Related: Ismatical. By the same path, ist is from 1811.

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Definitions of ism

ism (n.)
a belief (or system of beliefs) accepted as authoritative by some group or school;
Synonyms: doctrine / philosophy / philosophical system / school of thought
From wordnet.princeton.edu