How to say "immersion" in Japanese

• 水没すいぼつCommon
  noun, suru verb, intransitive verbThe literal, physical sense: something going under water — submergence rather than mental absorption. Choose it whenever 'immersion' involves actual water.
  町まち全体ぜんたいが水没すいぼつした。↗

  The entire town was under water.
• 没入ぼつにゅう
  noun, suru verb, intransitive verbThe figurative sense: being absorbed in an activity, work, or experience. When English 'immersion' means deep involvement rather than going under water, this is the word you want.
• 液浸えきしん
  nounA technical term of microscopy: the practice of immersing both the objective lens and the specimen in a liquid. Outside this specialist context it is not the word for 'immersion' in general use.
• 没入感ぼつにゅうかん
  nounThe felt sense of immersion: how absorbed a player or viewer becomes in a video game, movie, or similar experience. Choose it when 'immersion' names that subjective feeling.
• 嵌め込みはめこみ
  nounAt best a marginal match: its ordinary meaning is fitting or setting one thing into another, and 'immersion' survives only as a specialist term, notably in mathematics. Seldom the word you want here.

For literal submersion use 水没; for absorption in an activity, 没入; for the feeling of immersion in games or films, 没入感; for the microscopy technique, 液浸; 「嵌め込み」 is only a specialist term, seldom the right choice.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 水没すいぼつsubmergence
• 没入ぼつにゅうbeing absorbed (in)
• 液浸えきしんimmersion
• 没入感ぼつにゅうかんsense of immersion (in a video game, movie, etc.)
• 嵌め込みはめこみimmersion