notion

noun7

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. — 1704
2. •
   (informal) Inclination; intention; predisposition; disposition.

   • I have a notion to do it.
3. •
   A sentiment; an opinion.

   • 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.
4. •
   Any small article used in sewing and haberdashery, either for attachment to garments or as a tool, such as a button, zipper, or thimble.
5. •
   (informal) An invention; an ingenious device; a knickknack.
6. •
   [in the plural] (Ireland, informal) Pretentiousness or overambition.
7. •
   (no longer used) Sense; mind.

   • Who wrought with them, and all things else that might / To half a soul and to a notion crazed / Say, 'Thus did Banquo.' — 1606