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"occasionally" is also used as a crossword clue. If that's what you saw, the answer is often sometimes (9 letters).
Definitions
Now and then; not regularly.
Word origin
From Middle English occasionally, occasionaly, occasyoneely, occasyonly, equivalent to occasional + -ly.
Used in a sentence
“God ſetteth no houres for the morning or evening ſacrifice because they may occaſionally be changed.”
“Some perhaps worship only on alternate Sundays; others still more occasionally.”
“The journal, more occasionally, has turned to what might be called "fashionable" themes.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“at intervals”12 letters
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