A voluntary transgression of the law of God. It is a transgression (Latin: trans, beyond; gradi, to go) because it is an act whereby we go beyond the limits imposed on freedom. It is a voluntary transgression because it is committed knowingly and wiillngly. The law of God, which sin contravenes, comprises not only the natural and the Divine positive law, but also the just precepts of all legitimately constituted authority.

New Catholic Dictionary

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