Meaning of “relativity” in the English Dictionary

"relativity" in American English

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relativitynoun [ U ]

us /ˌrel·əˈtɪv·ɪ·t̬i/

physics a two-part theory in physics describing motion and the relationships between space, time, and energy:

Einstein’s theory of relativity

(Definition of “relativity” from the Cambridge Academic Content Dictionary © Cambridge University Press)