1. (

• buoyancy ,
• perkiness

) cheerfulness that bubbles to the surface ;

2. (

• airiness ,
• buoyancy

) the property of something weightless and insubstantial ;

3. (

• buoyancy ,

) the tendency to float in water or other liquid ;

4. (

• irrepressibility ,
• buoyancy ,

) irrepressible liveliness and good spirit; "I admired his buoyancy and persistent good humor" ;