Coherence theory of truth: ‘p is true’ means ‘p is consistent with all other propositions accepted as true’.
That a belief is true so far as it is consistent with a whole system of beliefs.
Source: ‘What is Good? What is Bad? The Value of All Values across Time, Place and Theories’ by John McMurtry, Philosophy and World Problems, Volume I-III, UNESCO in partnership with Encyclopedia of Life Support Systems: Oxford, 2004-11.