WordReference Random House Unabridged Dictionary of American English © 2026
prin′cipal diag′onal. 
  1. MathematicsSee under diagonal (def. 9).
  • 1960–65

'principal diagonal' also found in these entries (note: many are not synonyms or translations):
diagonal - trace - triangular matrix

Forum discussions with the word(s) "principal diagonal" in the title:


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