A set of principles or rules that are held to be foundational in a discipline.

A theoretical approach that is considered traditional or longstanding in a particular field.

पारंपरिक सिद्धांत

English Usage: "Many scientists still refer to classical theory when discussing fundamental physics."

Hindi Usage: "कई वैज्ञानिक मौलिक भौतिकी के संदर्भ में पारंपरिक सिद्धांत का उल्लेख करते हैं।"