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"recurring" is also used as a crossword clue. If that's what you saw, the answer is often perennial (9 letters).
Definitions
Happening again or repeatedly.
Used in a sentence
“He has recurring asthma attacks.”
“Revenge is a recurring theme in this novel.”
“Every rational number can be written as either a terminating decimal or a recurring decimal.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Periodic”9 letters
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