1

diagonal

play
adjective di·ag·o·nal \dī-ˈa-gə-nəl, -ˈag-nəl\

Definition of diagonal

  1. 1a :  joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same faceb :  passing through two nonadjacent edges of a polyhedron a diagonal plane

  2. 2a :  inclined obliquely from a reference line (such as the vertical) wood with a diagonal grainb :  having diagonal markings or parts a diagonal weave

Examples of diagonal in a Sentence

  1. The blanket is covered with diagonal stripes.

  2. the diagonal design ran up the wall all the way from the lower left to the upper right-hand corner

Origin and Etymology of diagonal

Latin diagonalis, from Greek diagōnios from angle to angle, from dia- + gōnia angle; akin to Greek gony knee — more at 1knee


First Known Use: 1563

Other Mathematics and Statistics Terms


2

diagonal

noun di·ag·o·nal

Definition of diagonal

  1. 1 :  a diagonal straight line or plane

  2. 2a (1) :  a diagonal direction (2) :  a diagonal row, arrangement, or patternb :  something oriented in diagonal position

  3. 3 :  slash 4

on the diagonal

  1. :  in an oblique direction :  diagonally

Examples of diagonal in a Sentence

  1. a design with strong diagonals

  2. the ramp was set at a low diagonal to make it easier for physically challenged patrons

1571

First Known Use of diagonal

1571

Other Mathematics and Statistics Terms



DIAGONAL Defined for English Language Learners

diagonal

play
adjective

Definition of diagonal for English Language Learners

  • of a straight line : joining two opposite corners of a shape (such as a square or rectangle) especially by crossing the center point of the shape

  • : not going straight across or up and down

diagonal

noun

Definition of diagonal for English Language Learners

  • : a diagonal line, direction, or pattern


DIAGONAL Defined for Kids

1

diagonal

play
adjective di·ag·o·nal \dī-ˈa-gə-nəl, -ˈag-nəl\

Definition of diagonal for Students

  1. 1 :  running from one corner to the opposite corner of a four-sided shape (as a square) a diagonal line

  2. 2 :  running in a slanting direction diagonal stripes

diagonally

\-nə-lē\ adverb

2

diagonal

play
noun di·ag·o·nal

Definition of diagonal for Students

  1. :  a line, direction, or pattern that runs in a slanting direction



Seen and Heard

What made you want to look up diagonal? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to glide in or as if in an airplane

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!