Proration

[Justin Bieber]

In fighting games, [proration] is a numerical value given to a certain attack that shows what percentage damage penalty you get for using the attack in a combo.
For example, lets say you have attack A with 100% proration and attack B with 80% proration, and both can combo into each other interchangeably. [Chaining] A-greater thanB will have no effect on the damage output by attack B because attack A has 100% proration. However, [chaining] B-greater thanA will have an effect on the damage output by A; B has 80% proration, so attack A will only do 80% damage in this combo. [Proration] effects can also be stacked, which is the reason why [button-mashing] comboers often find themselves doing very little damage near the end of their string of attacks.

[Luis Fok]

to calculate a cost, payment, or price according to the amount of something that has been used, in relation to the fixed rate for a larger total amount: