Strong AI is the belief that computers can (and will) be able to achieve full human-like intelligence, in part because human intelligence itself, so it would be claimed, is effectively built on a biological computer, the brain. Strong AI stands in contrast to weak AI which only seeks computer systems that perform in an intelligent manner even if they do so in very different ways to humans.
Defined on page 1
Used on pages 1, 4, 554, 555