D defs.my
Entry 3 senses Webster, 1913

Retrocession

/rĕtˌ-rōs-ĕsh'-ən/ · Re·tro·ces·sion · IPA /rˌɛtroʊsˈɛʃən/
01 n. The act of retroceding.
  1. 1.
    The act of retroceding.
  2. 2.
    The state of being retroceded, or granted back.
  3. 3.
    Metastasis of an eruption or a tumor from the surface to the interior of the body.(Med.)