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diagonal.

Joining two nonadjacent vertices (of a polygon or polyhedron).

8 characters3 syllables approx.English language

Meaning & usage

adj/daɪ̯ˈæɡ(ə)nəl/General-American, Received-Pronunciation/daɪ̯ˈeɪ̯ɡ(ə)nəl//dɑɪ̯ˈæɡənəl/Australia/dɑɪ̯ˈæɡənəu̯/
  1. Joining two nonadjacent vertices (of a polygon or polyhedron).

    not-comparable
  2. Having slanted or oblique lines or markings.

    not-comparable
  3. Having a slanted or oblique direction.

    not-comparable
  4. Of or related to the cater-corner (diagonally opposite) legs of a quadruped, whether the front left and back right or front right and back left.

    not-comparable
Where this word comes from

From Middle French diagonal, from Latin diagōnālis, from Ancient Greek διαγώνιος (diagṓnios, “from angle to angle”), from διά (diá, “across”) + γωνία (gōnía, “angle”).

noun/daɪ̯ˈæɡ(ə)nəl/General-American, Received-Pronunciation/daɪ̯ˈeɪ̯ɡ(ə)nəl//dɑɪ̯ˈæɡənəl/Australia/dɑɪ̯ˈæɡənəu̯/
  1. A line joining non-adjacent vertices of a polygon.

  2. Anything forming or resembling such a line A line or plane at an oblique angle to another.

  3. Anything forming or resembling such a line A line or cut across a fabric at an oblique angle to its sides.

  4. Anything forming or resembling such a line Synonym of slash ⟨/⟩.

    uncommon
Where this word comes from

From Middle French diagonal, from Latin diagōnālis, from Ancient Greek διαγώνιος (diagṓnios, “from angle to angle”), from διά (diá, “across”) + γωνία (gōnía, “angle”).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.