1. Modern Physics(Abstract Noun) The theory of relativity, or simply relativity in physics, usually encompasses two theories by Albert Einstein: special relativity and general relativity. Concepts introduced by the theories of relativity include: Measurements of various quantities are relative to the velocities of observers. আইনষ্টাইনৰ দুটা তত্বক বুজাই সাধাৰণ আপেক্ষিকতাবাদ আৰু বিশেষ আপেক্ষিকতাবাদ

English: relativity, theory of relativity,
Assamese: আপেক্ষিকতাবাদ, আপেক্ষিকতাবাদ তত্ব