noun

1. an obligating or being obligated
2. a binding contract, promise, moral responsibility, etc.
3. a duty imposed legally or socially; thing that one is bound to do by contract, promise, moral responsibility, etc.
4. the binding power of a contract, promise, etc.
5. 1. the condition or fact of being indebted to another for a favor or service received
   2. a favor or service
6. Law
   1. an agreement or duty by which one person (the obligor) is legally bound to make payment or perform services for the benefit of another (the obligee)
   2. the bond, contract, or other document setting forth the terms of this agreement

Etymology: ME obligacioun < OFr obligation < L obligatio