Immersion

1. Submersion in water for the purpose of Christian baptism, as, practiced by the Baptists.
2. 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.
3. The state of being overhelmed or deeply absorbed; deep engagedness.
4. The dissapearance of a celestail 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.