/ ˈbɔɪənt; NAmE ˈbuːjənt/ adjective
1.
( of prices, business activity, etc. ) tending to increase or stay at a high level, usually showing financial success :
a buoyant economy / market
buoyant sales / prices
a buoyant demand for homes
2.
cheerful and feeling sure that things will be successful :
They were all in buoyant mood.
3.
floating, able to float or able to keep things floating :
The boat bobbed like a cork on the waves: light and buoyant.
Salt water is more buoyant than fresh water.
► buoy·ancy / -ənsi; NAmE / noun [ U ]:
the buoyancy of the market
a mood of buoyancy
a buoyancy aid (= sth to help you float)
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WORD ORIGIN
late 16th cent.: from French bouyant or Spanish boyante , present participle of boyar to float, from boya buoy.