1. Of high or especially quick cognitive capacity, bright.
  2. Well thought-out, well considered.
    The engineer had a very intelligent design proposal for the new car.
    The general devised an intelligent strategy for the southern campaign.
  3. Characterized by thoughtful interaction.
    My girlfriend and I had an intelligent conversation.
  4. Having the same level of brain power as mankind.
    The hunt for intelligent life.
  5. Having an environment-sensing automatically-invoked built-in computer capability
    An intelligent network or keyboard.

The above text is a snippet from Wiktionary: intelligent
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