Principle
Principle noun - Law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature.
Usage example: the principles of internal-combustion engines
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Synonyms for Principle
Rationale is a synonym for principle. In some cases you can use "Rationale" instead a noun "Principle". popular alternative
Rationale
Rationale noun - Law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature.
Usage example: the rationale for capital punishment
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Synonyms for Rationale
Principle is a synonym for rationale in action topic. You can use "Principle" instead a noun "Rationale", if it concerns topics such as reason. popular alternative
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Rationale and Principle. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/principle/rationale
Principle & Rationale. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/principle/rationale>.
Rationale or Principle. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/principle/rationale.
Google Ngram Viewer shows how "principle" and "rationale" have occurred on timeline