Etymology
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buoyancy (n.)

1713, "relative lightness, quality of floating on water or other liquid," from buoyant + -cy. Figurative sense "cheerfulness, hopefulness" (of spirits, etc.) is from 1819. Meaning "power of supporting a body so that it floats" is from 1831.

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Definitions of buoyancy

buoyancy (n.)
cheerfulness that bubbles to the surface;
Synonyms: perkiness
buoyancy (n.)
the property of something weightless and insubstantial;
Synonyms: airiness
buoyancy (n.)
the tendency to float in water or other liquid;
buoyancy (n.)
irrepressible liveliness and good spirit;
I admired his buoyancy and persistent good humor
Synonyms: irrepressibility
From wordnet.princeton.edu

Dictionary entries near buoyancy

bunt

bunting

bunyip

buoy

buoyance

buoyancy

buoyant

bur

burble

burd

burden