Meaning & Definition
noun
A line segment connecting two non-adjacent vertices of a polygon or polyhedron.
In a rectangle, the diagonals are equal in length.
A straight line joining two opposite corners of a square, rectangle, or other shape.
The players moved the pieces along the diagonals of the chessboard.
adjective
Situated at an angle, especially in relation to right angles; not parallel or perpendicular.
The table was placed diagonally in the corner of the room for a more dynamic layout.
Relating to a diagonal line or direction in geometry.
The diagonal cut in the fabric added a unique touch to the dress.
Etymology
From Latin 'diagonalis', from 'diagon' meaning 'to cut across' or 'cutting across'.
Common Phrases and Expressions
diagonal slice:
A cut made at an angle rather than straight across.
diagonal line:
A line that goes from one corner to another in a shape.
Slang Meanings
Diagonally challenged
He's a bit diagonally challenged when it comes to sports.