1. [noun] Mental apprehension of whatever may be known, thought, or imagined; idea, concept.
2. [noun] A sentiment; an opinion.
3. [noun] (obsolete) Sense; mind. Shakespeare.
4. [noun] (colloquial) An invention; an ingenious device; a knickknack.
5. [noun] Any small article used in sewing and haberdashery, such as a button or zipper.
6. [noun] (colloquial) Inclination; intention; disposition.
7. [noun] A vague idea in which some confidence is placed; 'his impression of her was favorable'; 'what are your feelings about the crisis?'; 'it strengthened my belief in his sincerity'; 'I had a feeling that she was lying'.
8. [noun] A general inclusive concept.
9. [noun] An odd or fanciful or capricious idea; 'the theatrical notion of disguise is associated with disaster in his stories'; 'he had a whimsy about flying to the moon'; 'whimsy can be humorous to someone with time to enjoy it'.
10. [noun] (usually plural) small personal articles or clothing or sewing items; 'buttons and needles are notions'.
