Etymology: Middle English vailant, valiant,

From: Anglo-French vaillant worthy, strong, courageous; Present participle of valer to be of worth; Latin valere to be strong — more at wield

1: possessing or acting with bravery or boldness: courageous <valiant soldiers>
2: marked by, exhibiting, or carried out with courage or determination: heroic <valiant feats>

First Known Use: 14th century

— val•iant•ly adverb
— val•iant•ness noun

Merriam-Webster Dictionary