buoyancy

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buoy|an|cy /b'ɔɪənsi/
1 [N-UNCOUNT]
Buoyancy is the ability that something has to float on a liquid or in the air.
Air can be pumped into the diving suit to increase buoyancy.
2 [N-UNCOUNT]
Buoyancy is a feeling of cheerfulness.
...a mood of buoyancy and optimism.
3 [N-UNCOUNT]
There is economic buoyancy when the economy is growing.
The likelihood is that the slump will be followed by a period of buoyancy.

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