Rationale

n.

1.

An explanation or exposition of the principles of some opinion, action, hypothesis, phenomenon, or the like; also, the principles themselves.

Noun

1.

rationale - (law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature); "the rationale for capital punishment"; "the principles of internal-combustion engines" Synonyms: principle

account, allegorization, clarification, cracking, decipherment, decoding, demonstration, demythologization, editing, elucidation, emendation, enlightenment, euhemerism, excuse, exegesis, exemplification, explanation, explication, exposition, expounding, grounds, illumination, illustration, justification, light, logic, philosophy, pretense, pretext, principle, rational ground, rationalization, reason, reason for, reason why, reasoning, simplification, solution, stated cause, the big idea, the idea, the whatfor, the wherefore, the why, theory, underlying reason, unlocking