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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 buoy·an·cy /ˈbɔɪən(t)si, ˈbujən(t)-/
 浮力;輕快;樂觀

From: Webster's Revised Unabridged Dictionary (1913)

 Buoy·an·cy 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.
 

From: WordNet (r) 2.0

 buoyancy
      n 1: cheerfulness that bubbles to the surface [syn: perkiness]
      2: the property of something weightless and insubstantial [syn:
          airiness]
      3: irrepressible liveliness and good spirit; "I admired his
         bouyancy and persistent good humor" [syn: irrepressibility]