IMMERSION

Definition

1. noun sinking until covered completely with water. — synonyms: submergence, submerging, submersion
2. noun (astronomy) the disappearance of a celestial body prior to an eclipse. — synonyms: ingress
3. noun complete attention. — synonyms: concentration, engrossment, absorption
4. noun a form of baptism in which part or all of a person's body is submerged.
5. noun the act of wetting something by submerging it. — synonyms: submersion, ducking, dousing