The Collaborative International Dictionary of English v.0.48:
Justify \Jus"ti*fy\, v. t. [imp. & p. p. Justified; p. pr. &
vb. n. Justifying.] [F. justifier, L. justificare; justus
just + -ficare (in comp.) to make. See Just, a., and
-fy.]
[1913 Webster]
1. To prove or show to be just; to vindicate; to maintain or
defend as conformable to law, right, justice, propriety,
or duty.
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That to the height of this great argument
I may assert eternal providence,
And justify the ways of God to men. --Milton.
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Unless the oppression is so extreme as to justify
revolution, it would not justify the evil of
breaking up a government. --E. Everett.
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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.
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I can not justify whom the law condemns. --Shak.
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3. (Theol.) To treat as if righteous and just; to pardon; to
exculpate; to absolve.
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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.
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4. To prove; to ratify; to confirm. [Obs.] --Shak.
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5. (Print.) 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.
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6. (Law)
(a) 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) To qualify (one's self) as a surety by taking oath to
the ownership of sufficient property.
[Webster 1913 Suppl.]
The production of bail in court, who there
justify themselves against the exception of the
plaintiff. --Bouvier's
Law Dict.
[Webster 1913 Suppl.]
Syn: To defend; maintain; vindicate; excuse; exculpate;
absolve; exonerate.
[1913 Webster]