subduction
/səbˈdʌkʃən/noun
University
1
The action of being pushed or drawn beneath another object.
2
The process of one tectonic plate moving beneath another and sinking into the mantle at a convergent plate boundary.
3
The act of subducting or taking away.
4
Arithmetical subtraction.
5
A surjection between diffeological spaces such that the target is identified as the pushforward of the source.