Meaning of “truth” - Learner’s Dictionary

truth

noun us uk /truːθ/ plural truths /truːðz/
It would have been better to tell the truth.He was determined to get the truth out of her.I didn't tell her the truth because I thought it would be unkind.The judge was satisfied that she was telling the truth.Newspapers distorted the truth about their marriage.
the truth

B1 the real facts about a situation:

Do you think he was telling the truth?
I don't think we'll ever know the truth about what really happened.
BEING TRUE [ U ]

B2 the quality of being true:

There may be some truth in their claim.
TRUE FACT [ C ]

a fact or idea that people accept is true:

→ Opposite untruth

(Definition of “truth” from the Cambridge Learner’s Dictionary © Cambridge University Press)