Etymology
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submersion (n.)

early 15c., "suffocation by being plunged into water," from Late Latin submersionem (nominative submersio) "a sinking, submerging," noun of action from past participle stem of submergere "to sink" (see submerge). General sense from early 17c.

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Definitions of submersion

submersion (n.)
sinking until covered completely with water;
Synonyms: submergence / submerging / immersion
submersion (n.)
the act of wetting something by submerging it;
Synonyms: immersion / ducking / dousing
From wordnet.princeton.edu