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"solely" is also used as a crossword clue. If that's what you saw, the answer is often only (4 letters).
Definitions
without any others being included or involved
Word origin
From Middle English soly, sooly, soolly, equivalent to sole + -ly.
Used in a sentence
“The new chef was solely responsible for attending the grill.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“For one purpose”6 letters
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