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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

Today's standard picture of the universe is built on Einstein's general theory of relativity and the standard model of particle physics.

From Science Daily • Jan. 11, 2026

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

Then, Albert Einstein solved the tension by coming up with the theory of relativity, which explains how massive objects cause distortions in spacetime.

From Salon • Dec. 9, 2024

The theory of relativity does, however, force us to change fundamentally our ideas of space and time.

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