Immersion

an act or instance of immersing.

state of being immersed.

state of being deeply engaged or involved; absorption.

baptism in which the whole body of the person is submerged in the water.

Also called ingress. Astronomy . the entrance of a heavenly body into an eclipse by another body, an occultation, or a transit. Compare emersion ( def. 1 ) .

concentrating on one course of instruction, subject, or project to the exclusion of all others for several days or weeks; intensive

an immersion course in conversational French.

noun

engrossment , enthrallment , preoccupation , prepossession