Fundamental principle, also known as the basic principle, is an essential concept that lays the foundation for understanding any subject or system. It can be a guiding tenet, fundamental concept, or essential idea. Other synonyms for fundamental principle include basic philosophy, essential doctrine, foundational belief, primary axiom, principal concept, key concept, and core principle. Regardless of the term used, fundamental principles are essential to the understanding and practice of anything and should be well understood and applied in any field or endeavor. By knowing these synonyms, we can broaden our understanding of the basic principle and use them effectively in our daily lives.