Definition of truth noun from the Oxford Advanced American Dictionary

      

    truth

     noun
    noun
    NAmE//truθ//
     
    (pl. truths
    NAmE//truðz//
     
    , NAmE//truθs//
     
    )
     
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  1. 1the truth [singular] the true facts about something, rather than the things that have been invented or guessed Do you think she's telling the truth? We are determined to get at (= discover) the truth. The truth (of the matter) is we can't afford to keep all the staff on. I don't think you are telling me the whole truth about what happened. The awful truth about his disappearance finally dawned on her. It's the gospel truth (= completely true)! The sad truth is that, at 72, he is past his prime.
  2. 2[uncountable] the quality or state of being based on fact There is no truth in the rumors. There is not a grain of truth in what she says. His version of events does contain an element of truth. opposite falsity
  3. 3[countable] a fact that is believed by most people to be true universal truths She was forced to face up to a few unwelcome truths about her family. see also half-truth, home truth compare untruth
  4. Word Familytrue adjective (untrue)truth noun (untruth)truthful adjective (untruthful)truthfully adverbtruly adverbIdioms
    if (the) truth be known/told
     
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    used to tell someone the true facts about a situation, especially when these are not known by other people
    in truth(formal)
     
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    used to emphasize the true facts about a situation She laughed and chatted but was, in truth, not having much fun.
    nothing could be further from the truth
     
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    used to say that a fact or comment is completely false She thinks I don't like her but nothing could be further from the truth.
    to tell (you) the truth(informal)
     
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    used when admitting something To tell you the truth, I'll be glad to get home. I got a bit bigheaded, to tell the truth.
    truth is stranger than fiction(saying)
     
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    used to say that things that actually happen are often more surprising than stories that are invented
    (the) truth will out(saying)
     
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    used to say that people will find out the true facts about a situation even if you try to keep them secret
See the Oxford Advanced Learner's Dictionary entry: truth