c.1225, "moral life and conduct, moral excellence,"
vertu, from Anglo-Fr. and O.Fr.
vertu, from L.
virtutem (nom.
virtus) "moral strength, manliness, valor, excellence, worth," from
vir "man" (see
virile). Phrase
by virtue of (c.1230) preserves alternate M.E. sense of "efficacy." Wyclif Bible has
virtue where K.J.V. uses
power. The
seven cardinal virtues (c.1320) were divided into the natural (justice, prudence, temperance, fortitude) and the theological (hope, faith, charity). To
make a virtue of a necessity (c.1374) translates L.
facere de necessitate virtutem. [Jerome]