virtue

Virtue goes back to Latin virtus, a noun built from vir, 'man,' in Roman usage of the early centuries BCE. At first virtus meant manly excellence, courage, and worth shown in public life. It belonged to soldiers, magistrates, and citizens who proved themselves in action. The core idea was strength with moral weight.

Roman writers widened virtus beyond battlefield courage. Cicero in the 1st century BCE used it for moral excellence more generally, aligning it with Greek ethical thought. That expansion made the word fit philosophy as well as politics. It no longer meant merely male force, though the old root remained visible.

Old French received the word as vertu by the 11th century, and English borrowed virtue in the 13th century. Medieval English used virtue for moral goodness, spiritual power, and even an effective quality in herbs or stones. That range came from Latin too, where virtus could mean potency as well as excellence. The English word kept both ethics and efficacy for centuries.

Modern usage narrowed toward moral excellence, though traces of older senses remain in phrases like 'by virtue of.' The word's history is striking because it rises from social masculinity into abstract ethics. What began in Roman civic honor became a general name for moral good. The old force did not vanish; it was moralized.