diagonal vs italic

diagonal

adj
  • Having a slanted or oblique direction. 

  • 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. 

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

  • Having slanted or oblique lines or markings. 

noun
  • A line or cut across a fabric at an oblique angle to its sides. 

  • Synonym of slash ⟨/⟩. 

  • A line joining non-adjacent vertices of a polygon. 

  • A line or plane at an oblique angle to another. 

italic

adj
  • Having letters that slant or lean to the right; oblique. 

  • Designed to resemble a handwriting style developed in Italy in the 16th century. 

noun
  • An oblique handwriting style, such as used by Italian calligraphers of the Renaissance. 

  • A typeface in which the letters slant to the right. 

How often have the words diagonal and italic occurred in a corpus of books? (source: Google Ngram Viewer )