definition of
buoyancy

[1] #1 buoyancy n. [perkiness] cheerfulness that bubbles to the surface. wn

[2] #2 buoyancy n. [airiness] the property of something weightless and insubstantial. wn

[3] #3 buoyancy n. the tendency to float in water or other liquid. wn

[4] #4 buoyancy n. [irrepressibility] irrepressible liveliness and good spirit; "I admired his buoyancy and persistent good humor". wn