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Rare occurrence
Answer for the clue "Rare occurrence ", 9 letters:
blue moon
Word definitions for blue moon in dictionaries
Wikipedia
Word definitions in Wikipedia
Blue Moon is the second book in The Immortals series by author Alyson Noël released in July 2009. Blue Moon had spent 12 weeks on the New York Times Bestsellers list for children's books as of October 11, 2009.
WordNet
Word definitions in WordNet
n. a long time; "something that happens once in blue moon almost never happens"