What is the best definition of the word recur?

The best definition of the word "recur" is "return." When something recurs, it means that it happens again or happens repeatedly over time. It implies a cycle or repetition of an event, situation, or condition. The focus is on the aspect of coming back or happening again at intervals, which aligns directly with the meaning of "return." In various contexts, such as discussions about events, symptoms, or patterns, the term conveys the idea of recurrence—which is central to understanding how the word is used.