This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Becoming weaker or smaller.

adj. Especially of the lunar phase as it shrinks when viewed from the Earth.

n. The fact or act of becoming less or less intense.

n. The fact or act of becoming smaller.

v. Present participle of wane.

n. The act or process of waning, or decreasing.

adj. (of the Moon) pertaining to the period during which the visible surface of the moon decreases

n. a gradual decrease in magnitude or extent

"Manuel Zelaya, the deposed Honduran president, has complained about what he described as waning condemnation by the US of his removal from office, saying Washington's position on the coup was not clear."

drop-off    lessening    decrease   

decrescent   

wane   

abstaining    ascertaining    attaining    campaigning    caning