immersion

/i.mɛʁ.sjɔ̃/
1.
nounfeminine

submersion; the act of immersing something or someone (physical)

L'immersion du sous-marin a duré plusieurs heures.

The submarine's submersion lasted several hours.

2.
nounfeminine

complete immersion; deep involvement in an activity or environment

language immersion (learning by being surrounded by the language)

immersion in virtual reality or a fictional world (sense of presence)

J'ai fait une immersion linguistique d'un mois pour progresser en anglais.

I did a one-month language immersion to improve my English.

3.
nounfeminine

short professional placement or observational day to discover a job or workplace

Lors d'une journée d'immersion, j'ai suivi une infirmière pour découvrir le métier.

During a trial day, I shadowed a nurse to learn about the job.