3 Answers

 Justification means "making it OK".  There is "justification in hitting somebody who hits you first.  (I don't necessarily agree with this; it's just an example).  It is OK for this to happen because of something that happened previously.
"I am justified in asking for a raise.  My work history shows I am worth far more than I am paid."   
The justification for sentencing him to 20 years was the magnitude of his crime.  

And these from Wikipedia

THEOLOGY:  Justification is the chief article of faith describing God's act of declaring or making a sinner righteous through Christ's atoning sacrifice. The extent, means, and scope of justification are areas of significant debate. Broadly speaking, Catholic and Orthodox Christians distinguish between initial justification, which in their view occurs at baptism, and final justification, accomplished after a lifetime of striving to do God's will.
Protestants believe that justification is a singular act in which God declares an unrighteous individual to be righteous because of the Crucifixion of Jesus. Justification is granted to all who have faith, but even that is viewed as a gift from God by Lutherans and Calvinists, who use Eph 2:8, as well as Acts 16:14 and Phil 1:29 to support that belief. Justification is seen by Protestants as being the theological fault line that divided Catholic from Protestant during the Reformation.[1]

TYPESETTING  justification (can also be referred to as 'full justification') is the typographic alignment setting of text or images within a column or "measure" to align along both the left and right margin. Text set this way is said to be "justified".
In justified text, the spaces between words, and, to a lesser extent, between glyphs or letters (kerning), are stretched or sometimes compressed in order to make the text align with both the left and right margins. When using justification, it is customary to treat the last line of a paragraph separately by left or right aligning it, depending on the language direction. Lines in which the spaces have been stretched beyond their normal width are called loose lines, while those whose spaces have been compressed are called tight lines.

jus·ti·fy
(jst-f)v. jus·ti·fied, jus·ti·fy·ing, jus·ti·fies

v.tr.1. To demonstrate or prove to be just, right, or valid: justified each budgetary expense as necessary; anger that is justified by the circumstances.

2. To declare free of blame; absolve.

3. To free (a human) of the guilt and penalty attached to grievous sin. Used of God.

4. To demonstrate sufficient legal reason for (an action taken).

b. To prove to be qualified as a bondsman.

5. Printing To adjust the spacing within (lines in a document, for example), so that the lines end evenly at a straight margin.

v.intr. PrintingTo be adjusted in spacing so as to end evenly at the margin.

From:  www.thefreedictionary.com 

Justification

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Look up justification in Wiktionary, the free dictionary.

Justification may refer to:

Theory of justification, a part of epistemology that attempts to understand the justification of propositions and beliefsJustification (jurisprudence), defence in a prosecution for a criminal offenseJustification (theology), God's act of declaring or making a sinner righteous before GodJustification (typesetting), a kind of typographic alignmentIn mathematical logic, a justification is an unsatisfiable set.Justification may also refer to ad hoc hypotheses and explanationsRationalization (making excuses), a phenomenon in psychology