RETROCESSION

retrocession. Retrocession, n. the act of going or ceding back

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Re′tro‐ces″sion (?), n. [[Cf. F. rétrocession. See Retrocede.]] 1. 1. The act of retroceding.
2. 2. The state of being retroceded, or granted back.
3. 3. (Med.) Metastasis of an eruption or a tumor from the surface to the interior of the body.