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Definitions

theory of relativity

NOUN

einstein's theory

Synonyms

STRONGEST

relativity

WEAK

continuum theory e=mc2 energy-matter relationship general theory of relativity principle of equivalence principle of relativity special theory of relativity

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time — the interwoven fabric of space and time at the heart of Albert Einstein’s theory of relativity.

From Science Daily • Jun. 8, 2026

This streamlined version—co-written with Leonard Mlodinow, a physicist and popular-science author—retains explanations of vital topics, such as the curvature of spacetime and Einstein’s theory of relativity, but dispenses with the drier sections.

From The Wall Street Journal • May 19, 2026

Einstein's theory of relativity showed that time is not fixed or universal.

From Science Daily • May 18, 2026

Einstein's general theory of relativity, on the other hand, describes gravity and the motion of planets, stars, and galaxies.

From Science Daily • Mar. 9, 2026

This was true even of the special theory of relativity.

From "A Brief History of Time: And Other Essays" by Stephen Hawking