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Thinking is thought or reasoning. An example of thinking is when someone takes the time to work out a problem in their head. thinking. thinking. The act or practice of one that thinks; thought.
Definition of think for English Language Learners. : 1  to believe that something is true, that a particular situation exists, that something will happen, etc. : 2  to have an opinion about someone or something. : 3  to form or have (a particular thought) in your mind.