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blue moon n. 1. a. The third full moon in a three-month calendrical season that has four full moons. b. The second of two full moons occurring in the same month. 2. Informal A relatively long period of time: I haven't seen you in a blue moon.
blue moon
n.
1.
a. The third full moon in a three-month calendrical season that has four full moons.
b. The second of two full moons occurring in the same month.
2. Informal A relatively long period of time: I haven’t seen you in a blue moon.

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