There's a difference between a term being imprecise and being equivocal. Yeah, we use the term "think" in different ways. But it primarily refers to the operations unique to the human intellect with which we're all familiar.. deduction, analysis, synthesis, judgment, deliberation, abstraction, etc.

The thing that's special about these operations is that they deal with immaterial concepts. What's right? What's good? What's true? And so on. Computers have never achieved this and they never will, because they are only material arrangements, and so can only handle things on the material level. The human mind is clearly not reducible to that, because it can handle purely immaterial concepts.