Is a school of thought affirming truths found in actions that work and rejecting the possibility of overarching or purely objective notions of truth.

Pragmatism School is the right answer.

Explanation:

Pragmatism is a school of philosophy that emerged during the late phase of the 19th century and the early phase of the  20th Century.  this school held possible outcomes or real conclusions to be important elements of both truth and meaning. For instance, anything is true simply insofar as it serves.

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