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countable and uncountable, plural heroisms
The qualities characteristic of a hero, such as courage, bravery, fortitude, selflessness, etc.; the display of such qualities. quotations examples
At the time, with the D-Day invasion of Europe going on, their heroism was hardly noticed. Plenty of other heroes were dying elsewhere. Plenty of bigger bits of history were being made.
2022 January 12, Benedict le Vay, “The heroes of Soham...”, in RAIL, number 1948, page 43