noun (n)

• sinking until covered completely with water(noun.event)

  Synonym:
  immersion, submergence, submerging
  

  source: wordnet30
• the act of wetting something by submerging it(noun.act)

  Synonym:
  dousing, ducking, immersion
  

  source: wordnet30
• The act of submerging, or putting under water or other fluid, or of causing to be overflowed; the act of plunging under water, or of drowning.(noun)

  source: webster1913