noun
a gradual decrease in magnitude or extent (Freq. 1)
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the waning of his enthusiasm was obvious
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the waxing and waning of the moon
• Ant: ↑waxing
• Derivationally related forms: ↑wane
adjective
(of the Moon) pertaining to the period during which the visible surface of the moon decreases
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after full moon comes the waning moon
• Ant: ↑waxing
Useful english dictionary. 2012.