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The Collaborative International Dictionary of English v.0.48 (gcide)

Ablation \Ab*la"tion\, n. [L. ablatio, fr. ablatus p. p. of
auferre to carry away; ab latus, p. p. of ferre carry: cf.
F. ablation. See {Tolerate}.]
1. A carrying or taking away; removal. --Jer. Taylor.
[1913 Webster]

2. (Med.) Extirpation. --Dunglison. AS
[1913 Webster]

3. (Med.) Removing or destroying of a body tissue, especially
by a surgical procedure. --Dorland.
[AS]

4. (Geol.) Wearing away; superficial waste, as of glacial ice
or snow. --Tyndall.
[1913 Webster]

5. (Aerospace) Wearing away of the outer layers of a
protective shield or surface by the heat and aerodynamic
forces caused by flying through the atmosphere at
hypersonic speed, as during reentry from space; as,
ablation of the heat shield during reentry.
[PJC]