noun
the last fourth of the Moon's period of revolution around the Earth
• Hypernyms: ↑half-moon
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Astron.
the instant, approximately one week after a full moon, when half of the moon's disk is illuminated by the sun. See diag. under moon.
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last quarter,
1. the period of time between the second half moon and the new moon.
2. the phase of the moon represented by the half moon after full moon.
Useful english dictionary. 2012.