The term DECIDER can be defined by the following crossword solutions: ARBITER (7 letters), RUNOFF (6 letters), UMP (3 letters), EXAM (4 letters), REF (3 letters), COIN (4 letters), TOSS (4 letters), and PETAL (5 letters). An ARBITER is a person who makes a decision or judgement in a dispute, while a runoff is a second election held when no candidate receives a majority of the votes in the first election. An UMP is a short form of umpire, which is a person who makes decisions in sports games. An EXAM is a test or assessment used to measure knowledge or skills. A REF is a shortened form of referee, which is a person who makes decisions in sports games. A COIN TOSS is a method of making a decision by randomly choosing between two options. Finally, a PETAL is a part of a flower, and can be used as a metaphor for making a decision. All of these terms are related to the concept of making a decision, which is the definition of the term DECIDER.