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.

Definition of principal diagonal in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal