Meaning of “justify” in the English Dictionary

"justify" in British English

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justifyverb [ T ]

uk /ˈdʒʌs.tɪ.faɪ/ us /ˈdʒʌs.tə.faɪ/

B2 to give or to be a good reason for:

[ + -ing verb ] I can't really justify taking another day off work.
Are you sure that these measures are justified?
justify yourself

B2 If you justify yourself, you give a good reason for what you have done:

It was the only thing that I could do - I don't have to justify myself to anyone.

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(Definition of “justify” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"justify" in American English

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justifyverb [ T ]

us /ˈdʒʌs·təˌfɑɪ/

to show that something is reasonable, right, or true:

Her fears of a low voter turnout were justified when fewer than half of the people voted.
justification
noun [ C/U ] us /ˌdʒʌs·tə·fɪˈkeɪ·ʃən/

[ U ] She said that there was no justification for such rude behavior.

(Definition of “justify” from the Cambridge Academic Content Dictionary © Cambridge University Press)