The crossword solutions for the term AHA! (4) are EUREKA. This is an exclamation of joy or satisfaction that is used to express surprise, excitement, or triumph upon finding or discovering something. It is derived from the Ancient Greek word εὕρηκα, meaning 'I have found it'. The phrase is often associated with Archimedes, who is said to have shouted it when he discovered a method for determining the volume of an object.