Noun

(uncountable) Inadequacy or incompleteness.

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=17 citation , passage=The face which emerged was not reassuring. […]. He was not a mongol but there was a deficiency of a sort there, and it was not made more pretty by a latter-day hair cut which involved eccentrically long elf-locks and oiled black curls.}}

(countable) An insufficiency, especially of something essential to health.

* {{quote-magazine, date=2013-08-31, volume=408, issue=8851, magazine=(The Economist)

, title= Promotion and self-promotion , passage=One of academia’s deficiencies is that, though its lecture halls and graduate schools are replete with women, its higher echelons are not. Often, this is seen as a phenomenon specific to the sciences. … In fact, the disparity applies to the whole grove. Another report from 2006, by the American Association of University Professors, found the same ratio in the faculties of arts, humanities and social science, too.}}

(geometry) The amount by which the number of double points on a curve is short of the maximum for curves of the same degree.

(geometry) The codimension of a linear system in the corresponding complete linear system.

Noun

(es) (Spherical excess)

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.

* , King John , act 4, scene 2:

To gild refined gold, to paint the lily,

To throw a perfume on the violet, . . .

Is wasteful and ridiculous excess .

* , "Jealosy", in The Poetical Works of William Walsh (1797), page 19 (Google preview):

That kills me with excess' of grief, this with ' excess of joy.

The degree or amount by which one thing or number exceeds another; remainder.

The difference between two numbers is the excess of one over the other.

An undue indulgence of the appetite; transgression of proper moderation in natural gratifications; intemperance; dissipation.

* :

And be not drunk with wine, wherein is excess .

* 1667 , , Paradise Lost , Book III:

Fair Angel, thy desire . . .

. . . leads to no excess

That reaches blame

(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.

(British, insurance) A condition on an insurance policy by which the insured pays for a part of the claim.