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The diagonal in a square matrix that goes from the upper left corner to the lower right corner.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||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"
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