Intelligence should be placed in the context of biology:
Intelligence connects perception to action to help an organism survive.Intelligence is computation in the service of life, just as metabolism is chemistry in the service of life.
Intelligence does not imply perfect understanding; every intelligent being has limited perception, memory, and computation. Many points on the spectrum of intelligence-versus-cost are viable, from insects to humans.
AI seeks to understand the computations required for intelligent behavior and to produce computer systems that exhibit intelligence.
Aspects of intelligence studied by AI include perception, motor control, communication using human languages, reasoning, planning, learning, and memory.