principal diagonal

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principal diagonal

n.
The diagonal in a square matrix that goes from the upper left corner to the lower right corner.
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Noun1.principal diagonal - the diagonal of a square matrix running from the upper left entry to the lower right entry
diagonal - an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
References in periodicals archive ?
A magic square, well-known to recreational mathematicians, consists of a set of numbers (integers) arranged in a square, such that the sum of each row and column and both of the principal diagonals is the same.

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