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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.

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

Cosmologists use Einstein's general theory of relativity along with the Friedmann equations to describe how the universe changes over time.

From Science Daily • Jan. 11, 2026

According to Einstein's theory of relativity, gravity alters the flow of time.

From Science Daily • Dec. 30, 2025

For over a century, Einstein's general theory of relativity has been the foundation of our understanding of space and time.

From Science Daily • Nov. 8, 2025

Like quantum mechanics, the theory of relativity was born in light; this time it was the speed of light that caused the trouble.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife