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.

Noun

(en noun)

The point of interconnection between entities.

Public relations firms often serve as the interface between a company and the press.

(chemistry, physics) A thin layer or boundary between different substances or two phases of a single substance.

If water and oil are mixed together, they tend to separate, and at equilibrium they are in different strata with an oil-water interface in between.

The surface of a lake is a water-air interface .

(computing) The point of interconnection between systems or subsystems.

The data is sent over the air interface to the remote system.

(computing) The connection between a user and a machine.

The options are selected via the user interface .

(computing, object-oriented) The connection between parts of software.

This interface is implemented by several Java classes.

(computing, object-oriented) In object-oriented programming, a piece of code defining a set of operations that other code must implement.

The Audio and Video classes both implement the IPlayable interface .