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Adjective: waning  wey-ning
  1. (of the Moon) pertaining to the period during which the visible surface of the moon decreases
    "after full moon comes the waning moon"
Noun: waning  wey-ning
  1. A gradual decrease in magnitude or extent
    "the waning of his enthusiasm was obvious"; "the waxing and waning of the moon"
Verb: wane  weyn
  1. Grow smaller
    "Interest in the project waned";
    - decline, go down
  2. Become smaller
    "Interest in his novels waned"
  3. Decrease in phase
    "the moon is waning"

Type of: decrease, diminish, drop-off, fall, lessen, lessening

Antonym: wax, waxing

Encyclopedia: Waning