say it: BOY-uhn-see
buoyancy is a noun meaning "cheerfulness that bubbles to the surface". It carries 4 recorded senses.
cheerfulness that bubbles to the surface
the tendency to float in water or other liquid
irrepressible liveliness and good spirit
“I admired his buoyancy and persistent good humor”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for buoyancy come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.