"waning" in the noun sense
1. waning
a gradual decrease in magnitude or extent
"the waning of his enthusiasm was obvious"
"the waxing and waning of the moon"
"waning" in the verb sense
1. decline, go down, wane
grow smaller
"Interest in the project waned"
2. wane
become smaller
"Interest in his novels waned"
3. wane
decrease in phase
"the moon is waning"
"waning" in the adjective sense
1. waning
of the Moon) pertaining to the period during which the visible surface of the moon decreases
"after full moon comes the waning moon"
Source: WordNet® (An amazing lexical database of English)
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