Lewis Short
oblĭgāmentum (noun N) : obligo.
* Lit., a band (post-class.): caput obligamento obnoxium,Tert. Cor. Mil. 14.
* Trop., an obligation: legis obligamenta,Tert. adv. Marc. 3, 22; Hier. Ephes. 1, 14; Tert. Idol. 15.
Charlton T. Lewis, Charles Short, A Latin Dictionary