1. (n.) Frivolity; inappropriate lack of gravity and seriousness in deportment or character; trifling gayety; sportiveness; vanity.

2. (n.) The quality of weighing less than something else of equal bulk; relative lightness, especially as shown by rising through, or floating upon, a contiguous substance; buoyancy; -- opposed to gravity.

3. (n.) Lack of steadiness or constancy; disposition to change; fickleness; volatility.