Etymology
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heroism (n.)

1717, from French héroisme, from héros (see hero (n.1)).

updated on July 06, 2015

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Definitions of heroism from WordNet

heroism (n.)
the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle);
he showed great heroism in battle
Synonyms: gallantry / valor / valour / valorousness / valiance / valiancy
From wordnet.princeton.edu, not affiliated with etymonline.