Definitions
1.NounThe action of being pushed or drawn beneath another object.
2.NounThe process of one tectonic plate moving beneath another and sinking into the mantle at a convergent plate boundary.
3.NounThe act of subducting or taking away.
4.NounArithmetical subtraction.
5.NounA surjection between diffeological spaces such that the target is identified as the pushforward of the source.