Of an alliance, agreement, or promise: secure, binding. Also of an ally, partner, etc.: closely connected.

Of a promise, vow, etc.: containing a pledge of fidelity; given with solemn assurances; binding. In later use also: sincere.

Imposing obligation or morally binding; compulsory and not merely permissive; that must be done or practised.

= obligatory, adj. 1.

Binding, obligatory. literal and figurative.

Improperly for bound, adj.2, bounden, adj.1

Of things: Obligatory, due, bounden.

Originally: made binding or obligatory, bounden. In later use: compelled, necessitated. Obsolete. rare.

Imposing obligation; obligatory. Now rare.

Of an oath: Supremely binding, inviolable like the oath by the Styx, which the gods themselves feared to break.

= obligatory, adj. 2a.

figurative. Obligatory, restrictive, coercive.

Chiefly in predicative use. That must be done, carried out, or obeyed; of the nature of a duty; obligatory. Also: incumbent on or upon a person.

Binding, obligatory. Obsolete. rare.

(a) Serving to bind or tie up. (b) That has binding force, obligatory.

Legally or morally binding; obligatory. Now rare.

Morally binding, obligatory.

Obligatory.

Of a declaration, commitment, etc.: that imposes constraints or obligations on the person or group that made it.

Strict, rigorous, uncompromising. Law (esp. International Law). Designating a law which is binding and contains legally enforceable rights and…