Mental apprehension of whatever may be known, thought, or imagined; idea, concept.
A sentiment; an opinion.
An invention; an ingenious device; a knickknack.
Any small article used in sewing and haberdashery, either for attachment to garments or as a tool, such as a button, zipper, or thimble.
Inclination; intention; disposition.
That said to be possessed by someone who is obsessed with something or only able to think of one thing.