buoyancy
noun /ˈbɔɪənsi/
  /ˈbɔɪənsi/,  /ˈbuːjənsi/
 [uncountable]- a situation in which prices, business activity, etc. tend to increase or stay at a high level, usually showing financial success
- the buoyancy of the market
 
 - the feeling of being cheerful and feeling sure that things will be successful
- a mood of buoyancy
 
 - the fact of floating, being able to float or able to keep things floating
- a buoyancy aid (= something to help you float)