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Adjective: alterable  ol-tu-ru-bul [N. Amer], ól-tu-ru-bul or ol-tu-ru-bul [Brit]
  1. Capable of being changed or altered in some characteristic
    "alterable clothing"; "alterable conditions of employment"
  2. (of the punishment ordered by a court) capable of being changed to one less severe

See also: commutable

Antonym: unalterable