immersion

im|mer|sion /ɪm'ɜːrʃən/
1 [N-UNCOUNT] N in n
Someone's immersion in a subject is their complete involvement in it.
...long-term assignments that allowed them total immersion in their subjects.
2 [N-UNCOUNT] oft N in n
Immersion of something in a liquid means putting it into the liquid so that it is completely covered.
The wood had become swollen from prolonged immersion.

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