We found one dictionary that defines the word checkmater:

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1. checkmater: Wiktionary

Definitions from Wiktionary (checkmater) ▸ noun:  One who checkmates. ▸ Words similar to checkmater ▸ Usage examples for checkmater ▸ Idioms related to checkmater ▸ Wikipedia articles (New!) ▸ Popular adjectives describing checkmater ▸ Words that often appear near checkmater ▸ Rhymes of checkmater ▸ Invented words related to checkmater