a gradual decrease in magnitude or extent
"the waning of his enthusiasm was obvious"
"the waxing and waning of the moon"
The fact or act of becoming less or less intense.
"As the moon began to wane, its light grew dimmer each night until it was barely visible against the dark sky."
present participle of wane
"As the moon reached its final phase, the light began to wane before sunrise."
(of the Moon) pertaining to the period during which the visible surface of the moon decreases
"after full moon comes the waning moon"
Becoming weaker or smaller.
"The waning moon rose slowly over the horizon, its light fading as night deepened."