Word parts change

buoyant + -cy or buoy + -ancy

Pronunciation change

Noun change

Singular
buoyancy

Plural
none

 
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The Simple English Wikipedia has an article on:
 
buoyancy
  1. (physics) Buoyancy is the force pushing up on a body in a fluid.
    Wood floats in water because of buoyancy.
  2. (by extension) Resilience or cheerfulness.
    I am happy with your buoyancy after many bad things happened to you.

Related words change