Definition of notion

• - 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.
• - A sentiment; an opinion.
• - Sense; mind.
• - An invention; an ingenious device; a knickknack; as, Yankee notions.
• - Inclination; intention; disposition; as, I have a notion to do it.