Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun diagonal

5 senses of diagonal

Sense 1
diagonal -- ((geometry) a straight line connecting any two vertices of a polygon that are not adjacent)
       => straight line -- (a line traced by a point traveling in a constant direction; a line of zero curvature; "the shortest distance between two points is a straight line")

Sense 2
diagonal, bias -- (a line or cut across a fabric that is not at right angles to a side of the fabric)
       => straight line -- (a line traced by a point traveling in a constant direction; a line of zero curvature; "the shortest distance between two points is a straight line")

Sense 3
diagonal -- (an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals")
       => line -- (a formation of people or things one behind another; "the line stretched clear around the corner"; "you must wait in a long line at the checkout counter")
       => line -- (a formation of people or things one beside another; "the line of soldiers advanced with their bayonets fixed"; "they were arrayed in line of battle"; "the cast stood in line for the curtain call")

Sense 4
diagonal -- ((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)
       => set -- ((mathematics) an abstract collection of numbers or symbols; "the set of prime numbers is infinite")

Sense 5
solidus, slash, virgule, diagonal, stroke, separatrix -- (a punctuation mark (/) used to separate related items of information)
       => punctuation, punctuation mark -- (the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases)

Antonyms of adj diagonal

2 senses of diagonal

Sense 1
diagonal -- (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")

INDIRECT (VIA perpendicular, oblique) -> parallel -- (being everywhere equidistant and not intersecting; "parallel lines never converge"; "concentric circles are parallel"; "dancers in two parallel rows")
INDIRECT (VIA oblique, parallel) -> perpendicular -- (intersecting at or forming right angles; "the axes are perpendicular to each other")

Sense 2
aslant, aslope, diagonal, slanted, slanting, sloped, sloping -- (having an oblique or slanted direction)

INDIRECT (VIA vertical, inclined) -> horizontal -- (parallel to or in the plane of the horizon or a base line; "a horizontal surface")
INDIRECT (VIA inclined, horizontal) -> vertical, perpendicular -- (at right angles to the plane of the horizon or a base line; "a vertical camera angle"; "the monument consists of two vertical pillars supporting a horizontal slab"; "measure the perpendicular height")

Similarity of adj diagonal

2 senses of diagonal

Sense 1
diagonal -- (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")
       => oblique (vs. parallel) (vs. perpendicular) -- (slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled; "the oblique rays of the winter sun"; "acute and obtuse angles are oblique angles"; "the axis of an oblique cone is not perpendicular to its base")

Sense 2
aslant, aslope, diagonal, slanted, slanting, sloped, sloping -- (having an oblique or slanted direction)
       => inclined (vs. horizontal) (vs. vertical) -- (at an angle to the horizontal or vertical position; "an inclined plane")