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buoyancy /ˈbojənsi/  

  • noun
    [noncount] the ability of an object to float in water or air
    the natural buoyancy of cork
    the power of a liquid to make someone or something float
    The swimmer is supported by the water's buoyancy.
    the ability of someone or something to continue to be happy, strong, etc., through difficult times
    We hope that the economy will maintain its buoyancy.