1. plural of buoyancy; the ability or tendency of an object to float or rise in a fluid (liquid or gas)
Usage: physics/engineering term; commonly used in nautical and scientific contexts
2. plural of buoyancy; the quality of being cheerful, optimistic, or resilient
Usage: figurative use

Examples

• The buoyancies of different materials determine how well they float in water.
• Ships are designed with careful attention to buoyancies and weight distribution.
• Despite the setbacks, the team's buoyancies remained high throughout the season.
• The buoyancies of helium and hydrogen make them useful for balloons.
• Her natural buoyancies and positive attitude inspired everyone around her.
• Engineers calculated the buoyancies needed for the submarine to maintain neutral depth.
• The economic buoyancies of the market encouraged new investments.