The ability or tendency of an object to float in water or other fluid. The buoyancy of the life jacket kept him afloat in the water.
The power of a liquid to keep something afloat. The buoyancy of the saltwater made it easier for swimmers to stay on the surface.
A cheerful and optimistic attitude or disposition. Her natural buoyancy helped lift the spirits of everyone around her.
The economic condition of being able to maintain or increase levels of activity or growth. The buoyancy of the stock market was a positive sign for investors.