Reason • noun: A cause, explanation, or justification. Good or obvious cause to do something. The power of the mind to think, understand, and form judgements logically. One’s sanity. What is right, practical, or possible. • verb: Think, understand, and form judgements logically. Find a solution by considering possible options. Persuade with rational argument. Aether • noun: The clear sky, the upper regions of air. Substance formerly thought to permeate all space.