D defs.my
Entry 1 sense Webster, 1913

Waning

/wān'-ĭng/ · Wan·ing · IPA /ˈweɪ.nɪŋ/
01 n. The act or process of waning, or decreasing.
  1. 1.
    The act or process of waning, or decreasing.
    “This earthly moon, the Church, hath fulls and wanings, and sometimes her eclipses.” Bp. Hall.