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1. Oxford Dictionary

   diagonal

   • IPA[dʌɪˈaɡ(ə)nl]

   英式

   • adj.
     (of a straight line) joining two opposite corners of a square, rectangle, or other straight-sided shape.；(of a line) straight and at an angle; slanting
   • n.
     a straight line joining two opposite corners of a square, rectangle, or other straight-sided shape.；the set of elements of a matrix that lie on a line joining two opposite corners.

   • noun: diagonal, plural noun: diagonals

2. • 釋義

   adj.

   形容詞

   • 1. (of a straight line) joining two opposite corners of a square, rectangle, or other straight-sided shape.
   • ▪ (of a line) straight and at an angle; slanting a tie with diagonal stripes

   n.

   名詞

   • 1. a straight line joining two opposite corners of a square, rectangle, or other straight-sided shape.
   • ▪ the set of elements of a matrix that lie on a line joining two opposite corners.
   • ▪ a slanting straight line the bars of light made diagonals across the entrance tiles can be laid on the diagonal
   • ▪ a slanting row of squares whose colour is the same.