Webster
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Webster’s Revised Unabridged Dictionary · 1913

Buoyancy

Buoy′an·cy (·an·sy̆), n.; pl. Buoyancies. 1. The property of floating on the surface of a liquid, or in a fluid, as in the atmosphere; specific lightness, which is inversely as the weight compared with that of an equal volume of water.

2. (Physics) The upward pressure exerted upon a floating body by a fluid, which is equal to the weight of the body; hence, also, the weight of a floating body, as measured by the volume of fluid displaced.

Such are buoyancies or displacements of the different classes of her majesty's ships. Eng. Cyc.

3. Cheerfulness; vivacity; liveliness; sprightliness; — the opposite of heaviness; as, buoyancy of spirits.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.