What does ablation mean?
The definition of ablation
Ab*la”tion, n.
Etym: [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.
2 (Med.)
Extirpation. Dunglison.
3 (Geol.)
Wearing away; superficial waste. Tyndall.