Noun | 1. | principal diagonal - the diagonal of a square matrix running from the upper left entry to the lower right entrySynonyms: main diagonal |

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Princess Grace of Monaco

Princess of Wales

princess pine

princess royal

Princesse

Princesslike

Princeton

Princeton University

Princeton WordNet

Princewood

Princified

Principal

Principal axes of a quadric

principal axis

Principal challenge

Principal contract

**-- principal diagonal --**

Principal focus

principal investigator

Principal obligation

Principal of a quadric

Principal plane

Principal point

Principal ray

Principal section

principal sum

principal type

Principality

Principality of Andorra

Principality of Liechtenstein

Principality of Monaco

Principally

Principalness

Princess of Wales

princess pine

princess royal

Princesse

Princesslike

Princeton

Princeton University

Princeton WordNet

Princewood

Princified

Principal

Principal axes of a quadric

principal axis

Principal challenge

Principal contract

Principal focus

principal investigator

Principal obligation

Principal of a quadric

Principal plane

Principal point

Principal ray

Principal section

principal sum

principal type

Principality

Principality of Andorra

Principality of Liechtenstein

Principality of Monaco

Principally

Principalness