anti-de Sitter space

an·​ti-de Sit·​ter space | \ ¦an-ˌtī-də-¦si-tər- How to pronounce anti-de Sitter space (audio) , ¦an-tē- \

Definition of anti-de Sitter space

: the simplest hypothetical space-time that has negative curvature The simplest spacetime with positive curvature is called de Sitter space, after Willem de Sitter, the Dutch physicist who introduced it. Many cosmologists believe that the very early universe was close to being a de Sitter space. The far future may also be de Sitter-like because of cosmic acceleration. Conversely, the simplest negatively curved spacetime is called anti-de Sitter space. It is similar to hyperbolic space except that it also contains a time direction. Unlike our universe, which is expanding, anti-de Sitter space is neither expanding nor contracting. It looks the same at all times.— Juan Maldacena, Scientific American, November 2005 — compare de sitter space

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of anti-de Sitter space

1998, in the meaning defined above

History and Etymology for anti-de Sitter space

anti- entry 1 + de Sitter space

Learn More About anti-de Sitter space

Time Traveler for anti-de Sitter space

Time Traveler

The first known use of anti-de Sitter space was in 1998

See more words from the same year

Dictionary Entries Near anti-de Sitter space


anti-de Sitter space


See More Nearby Entries 

Statistics for anti-de Sitter space

Cite this Entry

“Anti-de Sitter space.” Dictionary, Merriam-Webster, Accessed 28 Jun. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Name That Food

  • a-light
  • Name these cookies!
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!