Webster's Revised Unabridged Dictionary · 1913

Justify

Justify , transitive verb

[French justifier, Latin justificare; justus just + -ficare (in comp.) to make. See Just, a., and -fy.]

1.
To prove or show to be just; to vindicate; to maintain or defend as conformable to law, right, justice, propriety, or duty.
That to the height of this great argument I may assert eternal providence, And justify the ways of God to men. — Milton
Unless the oppression is so extreme as to justify revolution, it would not justify the evil of breaking up a government. — E. Everett
2.
To pronounce free from guilt or blame; to declare or prove to have done that which is just, right, proper, etc.; to absolve; to exonerate; to clear.
I can not justify whom the law condemns. — Shakespeare
3.
(Theology) To treat as if righteous and just; to pardon; to exculpate; to absolve.
By him all that believe are justified from all things, from which ye could not be justified by the law of Moses. — Acts xiii. 39
4.
To prove; to ratify; to confirm. [Obsolete] — Shakespeare
5.
(Printing) To make even or true, as lines of type, by proper spacing; to align (text) at the left (left justify) or right (right justify) margins of a column or page, or at both margins; to adjust, as type. See Justification, 4.
6.
(a) (Law) To show (a person) to have had a sufficient legal reason for an act that has been made the subject of a charge or accusation.
(b)
(Law) To qualify (one's self) as a surety by taking oath to the ownership of sufficient property.
The production of bail in court, who there justify themselves against the exception of the plaintiff. — Bouvier's Law Dict

Justify , intransitive verb

1.
(Printing) To form an even surface or true line with something else; to fit exactly.
2.
(Law) To take oath to the ownership of property sufficient to qualify one's self as bail or surety.