What is the meaning of intelligent?

adjective

• Having the capacity for thought and reason especially to a high degree.
  • usage: "is there intelligent life in the universe"; "an intelligent question"
• Possessing sound knowledge.
  • usage: "well-informed readers"
  • synonyms: well-informed
• Exercising or showing good judgment.
  • usage: "healthy scepticism"; "a healthy fear of rattlesnakes"; "the healthy attitude of French laws"; "healthy relations between labor and management"; "an intelligent solution"; "a sound approach to the problem"; "sound advice"; "no sound explanation for his decision"
  • synonyms: healthy, levelheaded, level-headed, sound
• Endowed with the capacity to reason.
  • synonyms: reasoning, thinking