Sorry a made up definition of immersion won’t help your argument.
im·mer·sion
/iˈmərZHən,iˈmərSHən/
noun
noun: immersion
- the action of immersing someone or something in a liquid.
“his back was still raw from immersion in the icy Atlantic Ocean”
- deep mental involvement.
“his immersion in Jewish culture”
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a method of teaching a foreign language by the exclusive use of that language, usually at a special school.
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baptism by immersing a person bodily (but not necessarily completely) in water.
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rare•Astronomy
the disappearance of a celestial body in the shadow of or behind another.