Event Horizon Definition

ĭ-vĕnt
noun
The spherical boundary surrounding a black hole, within which there is such strong gravity that nothing, not even light, can escape.
Webster's New World
A point of no return, by analogy to the astronomical usage.
Wiktionary

Other Word Forms of Event Horizon

Noun

Singular:
event horizon
Plural:
event-horizons

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event horizon