1. (a.) Having the quality of rising or floating in a fluid; as a buoyant lifejacket; also, cheerful, as, buoyant spirits\; tending to rise or float; as, iron is buoyant in mercury.

2. (v. t. & i.) Bearing up, as a fluid; sustaining another body by being specifically heavier.

3. (v. t. & i.) Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits.

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