As per section 2 (e): “ Every promise and every set of promises, forming the consideration for each other, is an agreement.” Thus it is clear from this definition that a ‘promise’ is an agreement. What is a ‘promise’? the answer to this question is contained in section 2 (b) which defines the term.” When the person to whom the proposal is made signifies his assent thereto the proposal is said to be accepted. A proposal, when accepted, becomes a promise.” An agreement, therefore, comes into existence only when one party makes a proposal or offer to the other party and that other party signifies his assent (i.e., gives his acceptance) thereto. In short, an agreement is the sum total of ‘offer’ and ‘acceptance’.
On analyzing the above definition the following characteristics of an agreement become evident:
(a) At least two persons. There must be two or more persons to make an agreement because one person cannot inter into an agreement with himself.
(b) Consensus-ad-idem. Both the parties to an agreement must agree about the subject matter of the agreement in the same sense and at the same time.