Recurrence is a term used to describe the REPETITION of an event or phenomenon. The crossword solutions for this term include 'RETURN' (6 letters), 'DETERIORATION' (13 letters), 'FREQUENCY' (9 letters), 'REPETITION' (10 letters), 'RELAPSE' (7 letters), 'ATAVISM' (7 letters), and 'CYCLE' (5 letters). These words all refer to the idea of something happening again and again, either in a positive or negative way. For example, 'RETURN' could refer to a positive event such as a person coming back to a place they love, while 'DETERIORATION' could refer to a negative event such as a decline in health. Similarly, 'FREQUENCY' could refer to how often something happens, 'REPETITION' could refer to the act of doing something again and again, 'RELAPSE' could refer to a RETURN to an unhealthy habit, 'ATAVISM' could refer to a RETURN to an ancestral trait, and 'CYCLE' could refer to a pattern of events that repeat themselves. All of these words are related to the concept of recurrence.