Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “relativity”

relativity

noun [U]    /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 noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of relativity

Definitions of “relativity” in other dictionaries

Translations of “relativity”

Word of the Day

touch

an ability to do things in the stated, especially positive, way

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More