• (Britain, Ireland, informal) an immersion heater
  • the total submerging of a person in water as an act of baptism
  • (astronomy) The disappearance of a celestial body, by passing either behind another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite; opposed to emersion.
  • the act of immersing or the condition of being immersed
  • (mathematics) a smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding

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