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"frequently" is also used as a crossword clue. If that's what you saw, the answer is often often (5 letters).
Definitions
many times at short intervals
Word origin
From frequent + -ly.
Used in a sentence
“This question arises frequently.”
“He was enrolled but frequently didn't attend class.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Often”10 letters
Not quite right?
"Search similar patterns."
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