Since the Latin absolutus meant "set free", it's easy to see how absolution came to mean "set free from sin". (And also easy to see why absolute means basically "pure"—that is, originally, "free of sin".) The verb for absolution is absolve. Just as a priest absolves believers of their sins, you may absolve your brother of blame for a household disaster, or you yourself may in time be absolved for that scrape on the car backing out of a parking space.
13th century, in the meaning defined above
Middle English absoluciun, borrowed from Anglo-French, borrowed from Latin absolūtiōn-, absolūtiō "completion, acquittal, release," from absolū- (stem, before consonants, of absolvere "to set free, acquit, finish") + -tiōn-, -tiō suffix of action nouns — more at absolve
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Antonyms for absolution