Noun buoyancy has 3 senses
  1. buoyancy, perkiness - cheerfulness that bubbles to the surface
    --1 is a kind of cheerfulness, blitheness
  2. airiness, buoyancy - the property of something weightless and insubstantial
    --2 is a kind of lightness, weightlessness
  3. irrepressibility, buoyancy - irrepressible liveliness and good spirit; "I admired his bouyancy and persistent good humor"
    --3 is a kind of liveliness, life, spirit, sprightliness
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