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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
A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar. The phrase has nothing to do with the actual color of the moon, although ...
Wiktionary
Word definitions in Wiktionary
n. 1 (context rare English) The moon tinted towards blue as it appears in the sky, caused by dust or smoke in the atmosphere. 2 An extra full moon that appears in a subdivision of a year, namely: 3 # The third full moon in a quarter that contains four rather ...