Mathematics. a set of entries in a square matrix running either from upper left to lower right (main diagonal or principal diagonal) or lower left to upper right (secondary diagonal).

Chess. one of the oblique lines of squares on a chessboard: He advanced his bishop along the open diagonal.

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QUIZZES

Can You Ace This Quiz About “Compliment” vs. “Complement”?

Take this quiz to see if you really know the difference between “compliment” and “complement"!

Question 1 of 11

“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.