noun

• (countable) Representation created in the mind without the use of one's faculties of vision, sound, smell, touch, or taste; an instance of thinking.
• (uncountable) The operation by which mental activity arise or are manipulated; the process of thinking; the agency by which thinking is accomplished.
• (uncountable) A way of thinking (associated with a group, nation or region).
• (uncountable, now dialectal) Anxiety, distress.
• (uncountable) The careful consideration of multiple factors; deliberation.
• A very small amount, distance, etc.; a whit or jot.