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The Collaborative International Dictionary
Demersion

Demersion \De*mer"sion\n. [L. demersio.]

  1. The act of plunging into a fluid; a drowning.

  2. The state of being overwhelmed in water, or as if in water.
    --Ray.

Wiktionary
demersion

n. 1 The act of plunge into a fluid; a drowning. 2 The state of being overwhelmed in water, or as if in water.