The term 'Eureka!' is an expression of joy or satisfaction when one finds or discovers something. It is derived from the Ancient Greek phrase 'εὕρηκα' which translates to 'I have found it'. The crossword solutions for this term are BINGO (5 letters), AHA (3 letters), SUCCESS (7 letters), OHO (3 letters), IGOTIT (6 letters), ISEEIT (6 letters), IHAVEIT (7 letters), THATSIT (7 letters), and IVEGOTIT (8 letters). These words all express a sense of joy or satisfaction when something is found or discovered, similar to the original phrase 'Eureka!'.