Why is the ninth month called September?
1590s, from Middle French ligation, from Late Latin ligationem (nominative ligatio), noun of action from past participle stem of ligare "to bind" (see ligament).
ligation li·ga·tion (lī-gā'shən)n.
The act of binding or of applying a ligature.
The state of being bound.
Something that binds; a ligature.