WordReference English-Spanish Dictionary © 2015:

Principal Translations
irretroactividad nfnombre femenino: Sustantivo de género exclusivamente femenino ("mesa", "tabla"). (der: no retroactivo)not retroactive, not retrospective, non retroactive, non retrospective adjadjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house."
  non-retroactive nature, non-retrospective nature nnoun: Refers to person, place, thing, quality, etc.
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