Mutual assent or agreement among the parties to a contract regarding the substance of the contract. If the parties by their words and acts manifest an intention to be bound to a contract, they can be held accountable.

In order for a contract to be enforceable, the parties to it must come to a common understanding of the terms of their agreement. If no such common understanding has occurred with regard to a material clause in the contract, the contract may be void able. This common understanding is referred to at common law as a "meeting of the minds".

When all individuals to a contract agree to the substance and terms of that contract.

An agreement, by all parties, to a contract.

Meeting of the minds (also referred to as mutual assent or consensus ad idem) is a phrase in contract law used to describe the intentions of the parties forming the contract. In particular it refers to the situation where there is a common understanding in the formation of the contract. This condition is often considered a necessary requirement to the formation of a contract.