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Noun: enervation  ,e-nu(r)'vey-shun
  1. Lack of vitality
    "an enervation of mind greater than any fatigue"
  2. Serious weakening and loss of energy
    - debilitation, enfeeblement, exhaustion
  3. Surgical removal of a nerve

Derived forms: enervations

Type of: ablation, cutting out, excision, extirpation, weakening, weakness