<p><strong>Verb</strong></p><ul><li>(used without object) To have a conscious mind, to some extent of reasoning, remembering experiences, making rational decisions, etc.</li><li>To employ one's mind rationally and objectively in evaluating or dealing with a given situation: Think carefully before you begin.</li><li>To have a certain thing as the subject of one's thoughts: I was thinking about you.</li><li>To call something to one's conscious mind: I couldn't think of his phone number.</li><li>To consider something as a possible action, choice, etc.: She thought about cutting her hair.</li><li>To invent or conceive of something: We thought of a new plan.</li><li>To have consideration or regard for someone: Think of others first.</li><li>To esteem a person or thing as indicated: to think badly of someone.</li><li>To have a belief or opinion as indicated: I think so.</li><li>(of a device or machine, especially a computer) To use artificial intelligence to perform an activity analogous to human thought.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) To have or form in the mind as an idea, conception, etc.</li><li>To have or form in the mind in order to understand, know, or remember something else: Romantic comedy is all about chemistry: think Tracy and Hepburn.</li><li>To consider for evaluation or for possible action upon: Think the deal over.</li><li>To regard as specified: He thought me unkind.</li><li>To believe to be true of someone or something: to think evil of the neighbors.</li><li>To analyze or evolve rationally: to think the problem out.</li><li>To have as a plan or intention: I thought that I would go.</li><li>To anticipate or expect: I did not think to find you here.</li></ul><p><strong>Adjective</strong></p><ul><li>Of or relating to thinking or thought.</li><li>Informal: stimulating or challenging to the intellect or mind: Compare think piece. The think book of the year.</li></ul><p><strong>Noun</strong></p><ul><li>Informal: The act or a period of thinking: I want to sit down and give it a good think.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>To conceive of; imagine.</li><li>To have an opinion or judgment of.</li><li>To consider; anticipate: When one thinks of what the future may bring, one is both worried and hopeful.</li><li>To think about until a conclusion is reached; understand or solve by thinking.</li><li>To devise by thinking; contrive: He thought out a plan for saving time.</li><li>To devise or contrive by thinking: Can you think up an arrangement of furniture for this room?</li></ul>