Skip to main content
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Information Collection Notice
Trademark Concerns
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
Contact Us
Security
DMCA
© 1999–2026 Urban Dictionary ®
Mugs
Tees
Hoodies
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
Formally known as the Theory of Special Relativity, formulated by Albert Einstein in 1905. Deals with the perception of time and distance by observers in different frames of reference which are moving with respect to each other. An observer in one frame perceives that time is slower and distances are shorter in a different frame. Also postulates that the speed of light is perceived to be the same in every frame of reference, and that no form of matter or energy can travel faster than light.
Text fits
Save
Cancel