A term unfamiliar to most Mormons because it is not used much in Mormonism. It is God’s strict confirmation of the merits or demerits of man’s own actions. In other words, LDS justification is God’s act of rewarding the right and punishing the wrong.
Biblical Christianity teaches that it describes God's action of declaring people not guilty. No person can be declared innocent by observing the law (Romans 3:23). Only by faith, can people receive the verdict of "Not guilty!" and become acquitted of their sins.