tychism

noun
ty·​chism | \ ˈtīˌkizəm\
plural -s

Definition of tychism

1 : a theory that chance is an objective reality especially : a theory in evolution that variation may be purely fortuitous contrasted with uniformitarianism
2 : a proposition that absolute chance is operative in the cosmos

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History and Etymology for tychism

Greek tychē chance, fortune + English -ism; akin to Greek tychanein to happen, happen on, attain, teuchein to make, build

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not constant or steady

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