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The Collaborative International Dictionary
Abscession

Abscession \Ab*sces"sion\, n. [L. abscessio a separation; fr. absedere. See Abscess.] A separating; removal; also, an abscess. [Obs.]
--Gauden. Barrough.

Wiktionary
abscession

n. 1 A separating; removal. 2 An abscess.