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Monocolored means one color in respects to a card's or deck's color (i.e. white, blue, black, red or green).

From the glossary of the Comprehensive Rules (June 10, 2022—Commander Legends: Battle for Baldur's Gate)

Monocolored
An object with exactly one color is monocolored. Colorless objects aren’t monocolored. See rule 105, “Colors,” and rule 202, “Mana Cost and Color.”
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