immersion

definition: the act of wetting something by submerging it
example:
speech part: noun
synonyms: submersion
definition: a form of baptism in which part or all of a person's body is submerged
example:
speech part: noun
synonyms:
definition: complete attention
example:
speech part: noun
synonyms: concentration engrossment absorption
definition: (astronomy) the disappearance of a celestial body prior to an eclipse
example:
speech part: noun
synonyms: ingress
definition: sinking until covered completely with water
example:
speech part: noun
synonyms: submersion

How immersion is being used?