The word "thinking" refers to the process of using your brain to consider, reason, and reflect on ideas, problems, or concepts. It involves processing information, making decisions, solving problems, and forming judgments. Thinking can happen both consciously and unconsciously and is an essential function of the human mind.
The word "thinking" comes from the Old English word "þencan," which means "to consider, to conceive of, to have in mind." Over time, it evolved into the Middle English "thinken" and took its current form in Modern English.