sense; mind.
2. notion ·- a sentiment; an opinion.
3. notion ·- inclination; intention; disposition; as, i have a notion to do it.
4. notion ·- an invention; an ingenious device; a knickknack; as, yankee notions.
5. 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.