The foundational concept or rule that serves as a basis for a system or belief.

A fundamental proposition or assumption from which further principles can be derived.

पहला सिद्धांत

English Usage: In physics, the first principle is often the laws of thermodynamics.

Hindi Usage: भौतिकी में, पहला सिद्धांत अक्सर थर्मोडायनेमिक्स के नियम होते हैं।