noun (n)

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

  Synonym:
  submergence, submerging, submersion
  

  source: wordnet30
• (astronomy) the disappearance of a celestial body prior to an eclipse(noun.event)

  Synonym:
  ingress
  Antonym:
  egress, emersion
  

  source: wordnet30
• complete attention; intense mental effort(noun.cognition)

  Synonym:
  absorption, concentration, engrossment
  

  source: wordnet30
• a form of baptism in which part or all of a person's body is submerged(noun.act)

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

  Synonym:
  dousing, ducking, submersion
  

  source: wordnet30
• The act of immersing, or the state of being immersed; a sinking within a fluid; a dipping; as, the immersion of Achilles in the Styx.(noun)

  source: webster1913