diagonal vs principal diagonal

principal diagonal vs diagonal

diagonal and principal diagonal both are nouns.

diagonal is an adjective but principal diagonal is not an adjective.

Word	Noun	Adjective	Verb	Adverb
diagonal	Yes	Yes	No	No
principal diagonal	Yes	No	No	No

As nouns, principal diagonal is a hyponym of diagonal; that is, principal diagonal is a word with a more specific, narrower meaning than diagonal:

diagonal: an oblique line of squares of the same color on a checkerboard
principal diagonal: the diagonal of a square matrix running from the upper left entry to the lower right entry

Other hyponyms of diagonal include main diagonal, secondary diagonal.

diagonal (noun)	principal diagonal (noun)
a punctuation mark (/) used to separate related items of information	the diagonal of a square matrix running from the upper left entry to the lower right entry
an oblique line of squares of the same color on a checkerboard
(mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
a line or cut across a fabric that is not at right angles to a side of the fabric
(geometry) a straight line connecting any two vertices of a polygon that are not adjacent

diagonal (adjective)	principal diagonal (adjective)
having an oblique or slanted direction
connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face

Difference between diagonal and principal diagonal

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