to have a certain thing as the subject of one's thoughts: I was thinking about you. We could think of nothing else.
to call something to one's conscious mind: I couldn't think of his phone number.
to consider something as a possible action, choice, etc.: She thought about cutting her hair.
to invent or conceive of something: We thought of a new plan.
to have consideration or regard for someone: Think of others first.
to esteem a person or thing as indicated: to think badly of someone.
to have a belief or opinion as indicated: I think so.
(of a device or machine, especially a computer) to use artificial intelligence to perform an activity analogous to human thought.