Vŏl'a-tile-ness or Vŏl'a-til'i-ty, n.

n. [Fr. volatilité, Sp. volatilidad, It. volatilità.] 1. The quality of being volatile; disposition to exhale or evaporate; that property of a substance which disposes it to rise and float in the air, and thus to be dissipated; as, the volatility of fluids; ether is remarkable for its volatility. By the spirit of a plant, we understand that pure, elaborated oil, which, by reason of its extreme volatility, exhales spontaneously, and in which the odor or smell consists. Arbuthnot. 2. Great sprightliness; levity; liveliness; mutability; fickleness; as, the volatility of youth.