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ligation (n.)

"a tying or binding, as with a ligature," 1590s, from French ligation, from Late Latin ligationem (nominative ligatio), noun of action from past-participle stem of ligare "to bind" (from PIE root *leig- "to tie, bind"). Liaison is the same word in French form.

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Definitions of ligation from WordNet

ligation (n.)
(surgery) tying a duct or blood vessel with a ligature (as to prevent bleeding during surgery);
From wordnet.princeton.edu