truth

UK: /ˈtruːθ/ US: /truθ/ ,(tro̅o̅th)

Inflections of 'truth' (n): npl: truths

WordReference Random House Learner's Dictionary of American English © 2025

truth /truθ/   n., pl. truths (tro̅o̅ᵺz, tro̅o̅ths).

1. the actual state of a matter:
   [uncountable] Do you promise to tell the truth?
2. the condition of conforming with fact or reality;
   verity:
   [uncountable] The detective was assigned to check the truth of the witness's statement.
3. a fact, proposition, principle, or statement proven to be valid:
   [countable] mathematical truths.

Idioms

4. Idioms in truth, in reality;
   in fact;
   actually:
   She looked like a typical American housewife living in Moscow; in truth, she was a spy.

WordReference Random House Unabridged Dictionary of American English © 2025

truth  (tro̅o̅th),  n., pl. truths  (tro̅o̅ᵺz, tro̅o̅ths). 

1. the true or actual state of a matter:
   He tried to find out the truth.
2. conformity with fact or reality;
   verity:
   the truth of a statement.
3. a verified or indisputable fact, proposition, principle, or the like:
   mathematical truths.
4. the state or character of being true.
5. actuality or actual existence.
6. an obvious or accepted fact;
   truism;
   platitude.
7. honesty;
   integrity;
   truthfulness.
8. (often cap.) ideal or fundamental reality apart from and transcending perceived experience:
   the basic truths of life.
9. agreement with a standard or original.
10. accuracy, as of position or adjustment.
11. [Archaic.] fidelity or constancy.
12. in truth, in reality;
    in fact;
    actually:
    In truth, moral decay hastened the decline of the Roman Empire.

• Middle English treuthe, Old English trēowth (cognate with Old Norse tryggth faith). See true, -th¹ bef. 900

truth′less, adj. 
truth′less•ness, n. 
Synonyms

• 1. fact.
• 2. veracity.
• 7. sincerity, candor, frankness.
• 10. precision, exactness.

Antonyms

• 1. falsehood.
• 2, 4.
• 7. falsity.

Truth  (tro̅o̅th), n. 

So•journ•er  (sō′jûr nər, sō jûr′nər), (Isabella Van Wagener), 1797?–1883, U.S. abolitionist, orator, and women's-rights advocate, born a slave.

Collins Concise English Dictionary © HarperCollins Publishers::

truth / truːθ/ noun

1. the quality of being true, genuine, actual, or factual
2. something that is true as opposed to false
3. a proven or verified principle or statement; fact: the truths of astronomy
4. (usually plural) a system of concepts purporting to represent some aspect of the world: the truths of ancient religions
5. fidelity to a required standard or law
6. faithful reproduction or portrayal
7. honesty, reliability, or veracity
8. accuracy, as in the setting, adjustment, or position of something, such as a mechanical instrument

Related adjective(s): veritable, veracious

Etymology: Old English triewth; related to Old High German gitriuwida fidelity, Old Norse tryggr true

ˈtruthless adjective