Final answer:
The most popular definition of truth among philosophers is the Correspondence Theory of Truth, which states that truth is a reflection of how facts are in reality. Other notable theories include the Coherence Theory, the Pragmatic Theory, and the Deflationary Theory.
Step-by-step explanation:
The most popular way of defining truth among world philosophers is commonly believed to be the Correspondence Theory of Truth. This theory posits that a statement is true if it accurately reflects the way things are in reality. In simple terms, the theory holds that truth is the correspondence of a belief or proposition with the facts of the world. For example, the claim "It is raining outside" would be true if, upon observation, it is raining outside.
However, several other theories of truth exist and are actively discussed within philosophical circles. The Coherence Theory suggests that truth is a matter of degree, with propositions being true insofar as they fit into a coherent system of mutually supportive beliefs. The Pragmatic Theory of truth, formulated by thinkers like William James, argues that the truth of a proposition is determined by its practical efficacy and success in application. And lastly, the Deflationary Theory (or redundancy theory) suggests that asserting that a statement is true is merely to assert the statement itself, without ascribing to it any further property of 'truth'.