notionnoun/ˈnəʊʃən/

• 1

  Mental apprehension of whatever may be known, thought, or imagined; idea, concept.

  • What hath been generally agreed on, I content myself to assume under the notion of principles.
  • 1705-1715, George Cheyne, The Philosophical Principles of Religion Natural and Revealed there are few that agree in their Notions about them:.
• 2

  A sentiment; an opinion.

  • The extravagant notion they entertain of themselves.
  • December 2, 1832, John Henry Newman, Wilfulness, the Sin of Saul A perverse will easily collects together a system of notions to justify itself in its obliquity.
• 3

  obsoleteSense; mind.

  • Who wrought with them, and all things else that might / To half a soul and to a notion crazed / Say, 'Thus did Banquo.'
• 4

  An invention; an ingenious device; a knickknack.

  • Yankee notions
• 5

  Any small article used in sewing and haberdashery, either for attachment to garments or as a tool, such as a button, zipper, or thimble.

• 6

  Inclination; intention; predisposition; disposition.

  • I have a notion to do it.
• 7

  Pretentiousness or overambition.