think:1.To form or hold in the mind (an idea, image, or intuition); to carry out (something) as a mental operation.2. To turn over in the mind, meditate on, ponder over, consider.3. To exercise or occupy the mind, esp. the understanding, in any active way; to form connected ideas of any kind; to allow or cause a train of ideas to pass through the mind; to meditate, cogitate. ——Oxford English Dictionary

think: to use your mind to decide about something, form an opinion, imagine something etc.——Longman Dictionary of Contemporary English  @en