absolute horizon

noun

A boundary in spacetime, defined with respect to the external universe, inside which events cannot affect an external observer.

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Meanings

nounabsolute horizon (plural absolute horizons)

plural absolute horizons

  1. astrophysicsA boundary in spacetime, defined with respect to the external universe, inside which events cannot affect an external observer.
Cite this entry
APA

absolute horizon. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/absolute%20horizon

MLA

“absolute horizon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/absolute%20horizon. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “absolute horizon,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/absolute%20horizon.

Source: absolute horizon on Wiktionary, CC BY-SA 4.0.