A virago is a woman who demonstrates exemplary and heroic qualities. The word comes from the Latin word vir, meaning 'man' (cf. virile) to which the suffix -ago is added, a suffix that effectively re-genders the word to be female.
The word virago has almost always had an association with cultural gender transgression. A virago, of whatever excellence, was still identified by her gender. There are recorded instances of viragos (such as Joan of Arc) fighting battles, wearing men's clothing, or receiving the tonsure. The word virago could also be used disparagingly, to imply that a virago was not excellent or heroic, but was instead violating cultural norms. Thus virago joined pejoratives such as termagant,mannish, amazonian and shrew to demean women who acted aggressively or like men.
Historically, the concept of a virago reaches back into antiquity where Hellenistic philosophy asserted that elite and exceptionally heroic men had virtus. Virtus (once again linked to vir, the brave man abiding by society's highest values and ethics as opposed to homo, human being) defined the traits of excellence for a man in ancient Rome (and Greece), including valor and heroism, but also morality and physical strength. Women and non-elite or unheroic men (slaves, servants, craftsmen, merchants) were considered a lesser category, and believed to be less excellent in Roman morality. A woman, however, if exceptional enough could earn the title virago. In doing so, she surpassed the expectations for what was believed possible for her gender, and embodied masculine-like aggression and/or excellence. Virago, then, was a title of respect and admiration. In Christianity, a nun or holy woman who had become equal in divinity to male monks through practiced celibacy, exemplary religious practice and devotion, and intact virginity, was considered to have surpassed the limitations of her femaleness and was called virago. Firmicus Maternus describes virago as women who take on a man's character and desire intercourse with women like men.