General formal words:
* Vow: This suggests a solemn and serious promise, often made in a religious or ceremonial context.
* Pledge: This implies a strong commitment to fulfill the promise, often with a sense of public declaration.
* Undertaking: This emphasizes the commitment to a specific action or task.
* Agreement: This focuses on the mutual understanding and commitment between parties.
* Assurance: This stresses the certainty of the promise being fulfilled.
Legal terms:
* Covenant: This refers to a binding agreement, often in a legal context.
* Contract: This is a formal legal agreement that establishes specific obligations.
* Guarantee: This implies a strong assurance of fulfillment, often with legal implications.
Other options:
* Engagement: This implies a commitment to a specific action or task.
* Obligation: This focuses on the duty to fulfill the promise.
The best choice for you will depend on the specific context and the tone you wish to convey.