Justification (noun)
definition:
the act of defending or explaining or making excuses for by reasoning
example:
"The justification of barbarous means by holy ends is unacceptable to this administration."
Justification (noun)
definition:
something, such as a fact or circumstance, that shows an action to be reasonable or necessary
example:
"They considered misrule a justification for revolution."
Justification (noun)
definition:
a statement in explanation of some action or belief
example:
"They gave no justification in response to our questions."