Submersion/səbˈmɜːrʒn/ Definition 1 of 3Pro Tip 1/3Physical Action Refers to an actual movement of diving or sinking into a liquid. The submersion of the submarine was a spectacle to behold. Pro Tip 2/3Literal Use Used literally to describe objects or people entering liquid. The experiment required careful submersion of the metals in acid. Pro Tip 3/3Voluntary Act Can imply a deliberate act, like choosing to dive. He enjoyed the feeling of submersion in the cold lake.