What is the meaning of oblique?

noun

• Any grammatical case other than the nominative.
  • synonyms: oblique case
• A diagonally arranged abdominal muscle on either side of the torso.
  • synonyms: external oblique muscle, musculus obliquus externus abdominis, abdominal external oblique muscle

adjective

• Slanting or inclined in direction or course or position-neither parallel nor perpendicular nor right-angled.
  • usage: "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"
• Indirect in departing from the accepted or proper way; misleading.
  • usage: "used devious means to achieve success"; "gave oblique answers to direct questions"; "oblique political maneuvers"
  • synonyms: devious