# diagonal

A diagonal is made out of a straight line that’s set at an angle instead of straight up or across. If you picture a square and draw a line connecting the opposite corners, that’s a diagonal line.

You’ll find diagonal lines in geometry, and also in the world around you. A quarterback might throw a diagonal pass that angles across the field, or you might buy a snazzy new leotard with diagonal stripes. Diagonal can be either a noun or an adjective. You could call the steep slope of a hill a diagonal across the sky, or you could talk about the diagonal hillside reaching up toward the clouds.

Definitions of diagonal

having an oblique or slanted direction

synonyms:

inclined

at an angle to the horizontal or vertical position

connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face

“a
diagonal line across the page”
Synonyms:

oblique

slanting or inclined in direction or course or position–neither parallel nor perpendicular nor right-angled
3. noun

(geometry) a straight line connecting any two vertices of a polygon that are not adjacent

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type of:

straight line

a line traced by a point traveling in a constant direction; a line of zero curvature

4. noun

a line or cut across a fabric that is not at right angles to a side of the fabric

synonyms:

bias

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type of:

straight line

a line traced by a point traveling in a constant direction; a line of zero curvature

5. noun

(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

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type of:

set

(mathematics) an abstract collection of numbers or symbols

6. noun

an oblique line of squares of the same color on a checkerboard

“the bishop moves on the
diagonals
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types:

main diagonal, principal diagonal

the diagonal of a square matrix running from the upper left entry to the lower right entry
secondary diagonal

the diagonal of a square matrix running from the lower left entry to the upper right entry
type of:

line

a formation of people or things one behind another
line

a formation of people or things one beside another

7. noun

a punctuation mark (/) used to separate related items of information

synonyms:

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type of:

punctuation, punctuation mark

the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases

Word Family