I see. You don’t actually know anything about Christian theology of the atonement, so you go to a regular dictionary?
Please. Your methods of discussion are so childish and superficial that it’s frustrating to try to have any kind of substantive dialogue with you.
The idea of reparation is there in the Catholic theology of redemption (“atonement” is really not the most complete way of describing it), but it’s just part of the picture. Sections 599-623 of the
Catechism summarize the Catholic position here.
Now why would we speak of “reparation”? Because sin separates us from God. If God is good, then when we sin we are no longer in communion with God. And because God made us free, God can’t simply overcome that alienation by a decree, or He’d be overriding our freedom. Something has to be done on
our side to overcome the moral and spiritual gap between ourselves and God. But since we are sinners, we can’t do that ourselves. So God became human, and as a sinless human being offered Himself in perfect obedience to the Father. (God did
not legally pretend that Jesus was a sinner and punish him in our place, as some Protestants claim. That’s not the Catholic view.)
Personally, I don’t like the word “reparation,” precisely because it can be interpreted the way you do. But I don’t pick the vocabulary. The concept being expressed is certainly intellectually tenable.