Definition of supernatation in US English:

supernatation

noun

rare, historical
  • The action of floating on the surface of water or other liquid.

Origin

Early 17th century; earliest use found in Joseph Hall (1574–1656), bishop of Norwich, religious writer, and satirist. From post-classical Latin supernatation-, supernatatio from classical Latin supernatāt-, past participial stem of supernatāre + -iō.