n. The state of surpassing or going beyond limits; the being of a measure beyond sufficiency, necessity, or duty; that which exceeds what is usual or proper; immoderateness; superfluity; superabundance; extravagance; as, an excess of provisions or of light.n. The degree or amount by which one thing or number exceeds another; remainder; as, the difference between two numbers is the excess of one over the other.n. An undue indulgence of the appetite; transgression of proper moderation in natural gratifications; intemperance; dissipation.n. Spherical excess, the amount by which the sum of the three angles of a spherical triangle exceeds two right angles. The spherical excess is proportional to the area of the triangle.n. A condition on an insurance policy by which the insured pays for the first part of any claim, in exchange for a lower premium.adj. More than is normal, necessary or specified