Definition of float:
(n) :
a
buoyant device used to support something in water or another liquid; a sort of
trowel used for finishing
concrete surfaces
"attach the float and the weight to the fishing line, above the hook."
(v) :
of an object or substance, to be supported by a liquid of greater density than the object so as that part of the object or substance remains above the surface; to be capable of floating
"the boat floated on the water."