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1. Having the quality of rising or floating in a fluid; tending to rise or float; as, iron is buoyant in mercury. Buoyant on the flood.

2. Bearing up, as a fluid; sustaining another body by being specifically heavier. The water under me was buoyant. (Dryden)

3. Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits. Buoyantly.

Origin: From Buoy, & i.