The term 'on even terms' can be defined as a situation in which two people or groups are on EQUAL footing. This phrase is often used to describe a situation in which two parties are negotiating, and both sides have an EQUAL say in the outcome. The crossword solutions for this term are 'EQUAL' and 'quits'. 'EQUAL' refers to the idea that both sides are on the same level, while 'quits' implies that both sides are done with the negotiation and have reached an agreement. Together, these two words capture the essence of the phrase 'on even terms'.