The term “think” comes from the Old English word “├żencan” or “├żencian,” which means “to conceive in the mind” or “to consider.” It is related to the Proto-Germanic word “*thankjan” and the Proto-Indo-European root “*tong-” or “*tenk-,” meaning “to think” or “to feel.” The verb “think” refers to the mental process of using one’s mind to consider or reason about something, involving cognition, reflection, and decision-making.