adj.
1.at an angle
2.having an oblique or slanted direction diagonal n.
1.(geometry) a straight line connecting any two vertices of a polygon that are not adjacent
2.a line or cut across a fabric that is not at right angles to a side of the fabric
3.an oblique line of squares of the same color on a checkerboard
4.(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
5.a punctuation mark (/) used to separate related items of information
Idiom of the Day
make a reservation
to reserve a seat in an airplane or restaurant etc.
I phoned the airline last night so that I could make a reservation.