covenant

ot noun

1. An agreement to do or not do a particular thing.
2. A promise, incidental to a deed or contract, either express or implied.
3. A pact or binding agreement between two or more parties.
4. An incidental clause in an agreement.

fe’l verb

1. To enter into, or promise something by, a covenant.
2. To enter a formal agreement.
3. To bind oneself in contract.
4. To make a stipulation.