1. the ability or tendency to float in water or air or to rise in a fluid
Usage: physics
2. cheerful and optimistic attitude; liveliness of spirit
3. the ability to recover quickly from setbacks or difficulties; resilience

Examples

• The life jacket’s buoyancy kept him afloat in the rough water.
• Cork has natural buoyancy that makes it ideal for fishing floats.
• Her buoyancy lifted everyone’s spirits during the difficult project.
• Despite the criticism, he maintained his characteristic buoyancy.
• The team’s buoyancy helped them bounce back from their early losses.
• The helium balloon demonstrated the principle of buoyancy in air.
• His natural buoyancy made him popular at social gatherings.