(1):
An invention; an ingenious device; a knickknack; as, Yankee notions.
(2):
Inclination; intention; disposition; as, I have a notion to do it.
(3):
Mental apprehension of whatever may be known or imagined; an idea; a conception; more properly, a general or universal conception, as distinguishable or definable by marks or notae.
(4):
Sense; mind.
(5):
A sentiment; an opinion.