According to Dictionary.com

truth
 
- noun, plural truths
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 initial capital letter) 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.
 - Idiom
12. in truth, in reality; in fact; actually: In truth, moral decay hastened
    the decline of the Roman Empire.