waning

noun

a gradual decrease in magnitude or extent
規模や量が次第に減少すること
- the waning of his enthusiasm was obvious
  彼の熱意が衰えたのは明らかだった
- the waxing and waning of the moon
  月の満ち欠け

adjective

(of the Moon) pertaining to the period during which the visible surface of the moon decreases
（月について）可視月面が減少する期間に関係するさま
- after full moon comes the waning moon
  満月の後、下弦の月になる

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