having good understanding or a high mental capacity; quick to comprehend, as persons or animals: an intelligent student.
displaying or characterized by quickness of understanding, sound thought, or good judgment: an intelligent reply.
having the faculty of reasoning and understanding; possessing intelligence: intelligent beings in outer space.
Computers. pertaining to the ability to do data processing locally; smart: An intelligent terminal can edit input before transmission to a host computer. Compare dumb ( def 8 ).
Archaic. having understanding or knowledge (usually followed by of ).

1500–10; < Latin intelligent- (stem of intelligēns, present participle of intelligere, variant of intellegere to understand, literally, choose between), equivalent to intel- (variant of inter- inter-) + -lig- (combining form of leg-, stem of legere to pick up, choose; cf. lection) + -ent- -ent

intelligently, adverb
hyperintelligent, adjective
hyperintelligently, adverb
nonintelligent, adjective
nonintelligently, adverb
preintelligent, adjective
preintelligently, adverb
quasi-intelligent, adjective
quasi-intelligently, adverb
semi-intelligent, adjective
semi-intelligently, adverb
superintelligent, adjective

intelligent, intelligible, intellectual (see synonym study at the current entry).

1. bright. Intelligent, intellectual describe distinctive mental capacity. Intelligent often suggests a natural quickness of understanding: an intelligent reader. Intellectual implies not only having a high degree of understanding, but also a capacity and taste for the higher forms of knowledge: intellectual interests. 2. astute, clever, alert, bright, apt, discerning, shrewd, smart. See sharp.

1, 2. stupid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intelligent (ɪnˈtɛlɪdʒənt)
adj (foll by of)
1.  having or indicating intelligence
2.  having high intelligence; clever
3.  indicating high intelligence; perceptive: an intelligent guess
4.  guided by reason; rational
5.  (of computerized functions) able to modify action in the light of ongoing events
6.  archaic having knowledge or information: they were intelligent of his whereabouts

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, a back formation from intelligence or else from L. intelligens, prp. of intelligere (see intelligence).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The cute little creature requires a lot of ingenuity to foil because he is
  persistent, intelligent, and skillful.
For me your books are some of the best of intelligent stories dealing on crime
  and forensics.
They're not as intelligent as people make them out to be.
He wears a clean, straight mustache above an intelligent smile.
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