1. 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 prover; immoderateness; superfluity; superabundance; extravagance; as, an excess of provisions or of light. To gild refined gold, to paint the lily, to throw a perfume on the violet, . . . Is wasteful and ridiculous excess. (Shak) That kills me with excess of grief, this with excess of joy. (Walsh)
2. An undue indulgence of the appetite; transgression of proper moderation in natural gratifications; intemperance; dissipation. Be not drunk with wine, wherein is excess. (Eph. V. 18) Thy desire . . . Leads to no excess That reaches blame. (Milton)
(Science: geometry) 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.