the qualities or attributes of a hero or heroine: He showed great heroism in battle.
heroic conduct; courageous action: Pat's returning into the burning building was true heroism.

1660–70; hero + -ism; compare French héroïsme

1. intrepidity, valor, prowess, gallantry, bravery, courage, daring, fortitude.

1. cowardice, timidity.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heroism (ˈhɛrəʊˌɪzəm)
the state or quality of being a hero

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The first reports were of a doomed flight salvaged at the last moment by quick
  thinking and heroism.
His personal travails and heroism are, however, worthy of our enduring respect.
But relying on the heroism of lone coders has its cost.
In relevant stories, heroism is muted, though may be implied.
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