verb (used with object), justified, justifying.
to show (an act, claim, statement, etc.) to be just or right: The end does not always justify the means.
to defend or uphold as warranted or well-grounded: Don't try to justify his rudeness.
Theology. to declare innocent or guiltless; absolve; acquit.
to make (a line of type) a desired length by spacing the words and letters, especially so that full lines in a column have even margins both on the left and on the right.
to level and square (a strike).
verb (used without object), justified, justifying.
to show a satisfactory reason or excuse for something done.
to qualify as bail or surety.
Printing. (of a line of type) to fit exactly into a desired length.

1250–1300; Middle English justifien < Old French justifier < Late Latin jūstificāre, equivalent to Latin jūsti- (combining form of jūstus just1) + -ficāre -fy

justifier, noun
justifyingly, adverb
half-justified, adjective
prejustify, verb (used with object), prejustified, prejustifying.
rejustify, verb (used with object), rejustified, rejustifying.
unjustified, adjective
well-justified, adjective

1. vindicate; validate. 2. excuse.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
justify (ˈdʒʌstɪˌfaɪ)
vb , -fies, -fying, -fied
1.  (often passive) to prove or see to be just or valid; vindicate: he was certainly justified in taking the money
2.  to show to be reasonable; warrant or substantiate: his behaviour justifies our suspicion
3.  to declare or show to be free from blame or guilt; absolve
4.  law
 a.  to show good reason in court for (some action taken)
 b.  to show adequate grounds for doing (that with which a person is charged): to justify a libel
5.  (also intr) printing, computing to adjust the spaces between words in (a line of type or data) so that it is of the required length or (of a line of type or data) to fit exactly
6.  a.  Protestant theol to account or declare righteous by the imputation of Christ's merits to the sinner
 b.  RC theol to change from sinfulness to righteousness by the transforming effects of grace
7.  (also intr) law to prove (a person) to have sufficient means to act as surety, etc, or (of a person) to qualify to provide bail or surety
[C14: from Old French justifier, from Latin justificāre, from jūstusjust + facere to make]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, "to administer justice," also "to show (something) to be just or right," from O.Fr. justifer, from L. justificare "act justly toward, make just," from justificus "dealing justly, righteous," from justus "just" (see just (adj.)) + root of facere "to do" (see
factitious). Meaning "to make exact" (now largely restricted to typesetting) is from 1551.
Online Etymology Dictionary, © 2010 Douglas Harper
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