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Confusing "Complement" and "Compliment"

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A "complement" is a "companion; accessory"; as a verb, it means "accompany; go together with".

A "compliment", however, is a "remark of praise or flattery"; as a verb, it means to "praise; flatter".

Similarly, "complementary" means "complementing well" (or in geometry, "adding up to a right angle"), and "complimentary" means "flattering" or "included free of charge".

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