[Middle English, moving easily, from Old French, from Latin volūbilis, revolving, fluent, from volvere, to roll; see wel-2 in Indo-European roots.] vol'u·bil'i·ty, vol'u·ble·ness n., vol'u·bly adv.
1575, "liable to constant change," from Fr. voluble, from L. volubilis "that turns around, rolling, flowing, fluent" (of speech), from volvere "to turn around, roll" (see vulva). Meaning "fluent, talkative" first recorded 1588.