The best replacement for immersion is submersion.

The best alternatives to immersion are rated as following:
★★★★★  submersion
★★★★★  rosetta stone
★★★★  emersion
★★★★  sprinkling
★★★  bilingual education
★★★  sony
★★  counterflow
★  bilingual
★  counterflow chiller
★  plate chiller
★  boscam
★  immersion
★  counterflow wort chiller
★  esl
  pour over
  sprinkle
  embedding
  boiler
  sprinkling baptism
  pouring baptism
  integration
  presence
  pouring
  interactivity
  dual language
  augmentation
  berlitz
  infant baptism
  electric shower
  chinese immersion
  total immersion
  partial immersion

Your alternative for immersion is not listed? Suggest!
Speaking about immersion, one probably shouldn't forget about coverslip.

Other search terms related to immersion and their ratings are:
★★★★★ coverslip
You have in mind a companion for immersion and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of immersion in all years. Click on graph for more.
immersion
submersion
rosetta stone