D defs.my
Entry 2 senses Webster, 1913

Demersion

· De·mer·sion · IPA /diˈmɜː(ɹ)ʒən/
01 n. The act of plunging into a fluid; a drowning.
  1. 1.
    The act of plunging into a fluid; a drowning.
  2. 2.
    The state of being overwhelmed in water, or as if in water.