Noun

(uncountable) the cutting ability of an edge; keenness

(uncountable) the fineness of the point a pointed object

(countable) The product or result of being sharp.

(of food etc) pungency or acidity

(of an image) distinctness, focus

(of intelligence) acuteness or acuity

*{{quote-news

, year=2012 , date=June 19 , author=Phil McNulty , title=England 1-0 Ukraine , work=BBC Sport citation , page= , passage=A lack of match sharpness was perhaps to blame for Rooney squandering England's best chance after 27 minutes.}}

(obsolete) edge or blade

*{{quote-book

, year=1760 , author=John Marchant, Gent. Mr. Gordon, Daniel Bellamy, and others. , title=A New Complete English Dictionary... citation , passage=CUT-WATER, or KNEE OF THE HEAD [S.] the ?harpne?s of the head of the ?hip, below the beak;}}

*{{quote-book

, year=ca. 1395 , author=John Wycliffe et al. , title=Joshua 6:21 citation , passage=also thei smytiden bi the scharpnesse of swerd, oxun, and scheep, and assis.}}

Noun

(uncountable) Capacity of mind, especially to understand principles, truths, facts or meanings, acquire knowledge, and apply it to practice; the ability to learn and comprehend.

* 1912 , (Edgar Rice Burroughs), (Tarzan of the Apes), Chapter 5

Not so, however, with Tarzan, the man-child. His life amidst the dangers of the jungle had taught him to meet emergencies with self-confidence, and his higher intelligence resulted in a quickness of mental action far beyond the powers of the apes.

* {{quote-magazine, date=2013-07-19, author= Ian Sample

, volume=189, issue=6, page=34, magazine=(The Guardian Weekly) , title= Irregular bedtimes may affect children's brains , passage=Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits.  ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.}}

(countable) An entity that has such capacities.

* Tennyson

The great Intelligences fair / That range above our mortal state, / In circle round the blessed gate, / Received and gave him welcome there.

(uncountable) Information]], usually secret, about the enemy or about hostile [[activity, activities.

(countable) A political or military department, agency or unit designed to gather information, usually secret, about the enemy or about hostile activities.

(dated) Acquaintance; intercourse; familiarity.

* Clarendon

He lived rather in a fair intelligence than any friendship with the favourites.