four color theorem

proper noun

A theorem stating that given any separation of a plane into contiguous regions, producing a figure called a map, no more than four colors are required to color the regions so that no two adjacent regions have the same color (adjacent being defined as two regions sharing a boundary, not counting corners, in which three or more regions share a boundary).

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Meanings

proper nounthe four color theorem
  1. graph theoryA theorem stating that given any separation of a plane into contiguous regions, producing a figure called a map, no more than four colors are required to color the regions so that no two adjacent regions have the same color (adjacent being defined as two regions sharing a boundary, not counting corners, in which three or more regions share a boundary).
Cite this entry
APA

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

MLA

“four color theorem.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/four%20color%20theorem. Accessed November 4, 2026.

Chicago

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

Source: four color theorem on Wiktionary, CC BY-SA 4.0.