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

adjective. Becoming weaker or smaller.

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

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

noun. The fact or act of becoming smaller.

verb. Present participle of wane.

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

noun. a gradual decrease in magnitude or extent

"And when she is exactly opposite the sun, she shines with a full light, having arrived at the seventh sign; and even while she is there, having advanced but a very little further, she begins to diminish, which we call waning; and as she gets older, she resumes the same shapes that she had while increasing."

decrease  drop-off  lessening  

abstaining  ascertaining  attaining  campaigning  caning  

aging  at rest  calm  cloistered  coming apart  

wane