Definition - What does Promise mean?
A promise, under the definition of the law, refers to a statement that a person makes that is legally binding upon the person who makes the promise. The legal ramifications of a promise that is made will typically arise in the area of contract law. A promise can refer to a person’s obligation to do or not do something, or to deliver or make a payment for something.
Justipedia explains Promise
A word that is more common used in the legal field to define a legal promise is the word consideration. Under United States contract law, a valid contract cannot be formed unless there is valid consideration, also known as a valid promise. For example, if Albert promises to pay Bob $30 for mowing his lawn, both Albert and Bob have entered into a valid legal contract because of their promises (or consideration) to each other.