Definition of principal diagonal in English:

principal diagonal

Syllabification: prin·ci·pal di·ag·o·nal

noun

Mathematics
  • The set of elements of a matrix that lie on the line joining the top left corner to the bottom right corner.
    More example sentences
    • The resulting number square is a magic square, as the sum of the numbers in any row or column, (or along the principal diagonal) is equal to 260.

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