The most common and most likely answer to this crossword clue is the 9 letter word MYTHOLOGY
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The cryptic/wordplay part
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What does MYTHOLOGY mean?
MYTHOLOGY noun- The collection of myths of a people, concerning the origin of the people, history, deities, ancestors and heroes.
- A similar body of myths concerning an event, person or institution.
- Pervasive elements of a fictional universe that resemble a mythological universe.
- The systematic collection and study of myths.