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1. Having intelligence: Is there intelligent life elsewhere in the galaxy?
2. Having a high degree of intelligence; mentally acute: an intelligent student.
3. Showing sound judgment and rationality: an intelligent decision; an intelligent solution to the problem.
4. Appealing to the intellect; intellectual: a film with witty and intelligent dialogue.

[Latin intelligēns, intelligent-, present participle of intellegere, intelligere, to perceive : inter-, inter- + legere, to choose; see leg- in Indo-European roots.]

in·tel′li·gen′tial (-jĕn′shəl) adj.
in·tel′li·gent·ly adv.
Synonyms: intelligent, bright, brilliant, smart, intellectual
These adjectives mean having or showing mental keenness. Intelligent usually implies the ability to cope with new problems and to use the power of reasoning and inference effectively: The company put its most intelligent engineers to work on rectifying the design flaw. Bright implies quickness or ease in learning: She was a bright student who was soon at the head of the class. Brilliant suggests unusually impressive mental acuteness: "The dullard's envy of brilliant men is always assuaged by the suspicion that they will come to a bad end" (Max Beerbohm).
Smart refers to quick intelligence and often a ready capability for taking care of one's own interests: You were smart to buy your house when prices were low. Intellectual implies the capacity to grasp difficult or abstract concepts: The former professor was the more intellectual candidate.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Therefore what he gives (Whose praise be ever sung) to man in part Spiritual, may of purest Spirits be found No ingrateful food: and food alike those pure Intelligential substances require As doth your Rational; and both contain Within them every lower facultie Of sense, whereby they hear, see, smell, touch, taste, Tasting concoct, digest, assimilate, And corporeal to incorporeal turn.
Anyone who aspires to lead the Yoruba like Awo did would have gone through the crucible of strategies that yielded the formation of Egbe Omo Oduduwa, later Egbe Afenifere, which transmuted to Action Group and its eventual triumph over the NCNC, which had earlier seized the psyche of the Lagos intelligential at the time.
I'm watching the news, doing the crossword - and to top this intelligential overhaul, Channel 4's Countdown is being recorded and watched back at the end of each day.
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