immersion - noun

sinking until covered completely with water

(astronomy) the disappearance of a celestial body prior to an eclipse

complete attention; intense mental effort

a form of baptism in which part or all of a person's body is submerged

the act of wetting something by submerging it

immersion - thesaurus

absorption   concentration   dousing   ducking   engrossment   ingress   submergence   submerging   submersion