The term Modernism usually refers to the early part of the twentieth century — sometimes beginning with the First World War in 1914, and continuing through the 1930s or so — perhaps up to the Second World War. Some of the most influential Modernist writers tried some radical experiments with form: poets like Pound and Eliot working in free verse, for instance, and novelists like Joyce, Woolf, and Stein experimenting with stream of consciousness and elaborate language games.

From the Guide to Literary Terms by Jack Lynch.
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Note: This guide is still in the early stages of development.
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