We found one dictionary that defines the word four-colour map problem:

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1. four-colour map problem: Encyclopedia

▸ Words similar to four-colour map problem ▸ Usage examples for four-colour map problem ▸ Idioms related to four-colour map problem ▸ Wikipedia articles (New!) ▸ Words that often appear near four-colour map problem ▸ Rhymes of four-colour map problem ▸ Invented words related to four-colour map problem