The term 'recurring at intervals' can be summarized by two crossword solutions: 'PERIODIC' (8 letters) and 'REGULAR' (7 letters). This term is used to describe something that happens repeatedly in a set pattern or cycle. It can refer to events, activities, or processes that occur at REGULAR intervals, such as a weekly meeting or a monthly payment. It can also refer to natural phenomena, such as the phases of the moon or the changing of the seasons.