/ Dictionary / Index B buoyancy: Meaning and Definition of Find definitions for: buoy•an•cy Pronunciation: (boi'un-sē, b'yun-sē), [key] — n. the power to float or rise in a fluid; relative lightness. the power of supporting a body so that it floats; upward pressure exerted by the fluid in which a body is immersed. lightness or resilience of spirit; cheerfulness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: buoyancy (Thesaurus) buoyage buoyancy compensator Related Content Daily Word Quiz: raconteur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language