What term describes a contract presented on a take-it-or-leave-it basis?

A contract presented on a take-it-or-leave-it basis is known as a contract of adhesion. This type of contract is typically drafted by one party, usually the party that has greater bargaining power, and presented to the other party, who has little or no ability to negotiate the terms. The essential characteristic of a contract of adhesion is its unilateral nature regarding the terms of agreement; the weaker party must either accept the contract as it stands or reject it entirely.

In the context of contracts, this can lead to situations where the adhering party may have limited knowledge or understanding of the provisions, as they may feel compelled to agree for reasons of necessity or convenience. This type of contract is commonly found in insurance agreements, consumer contracts, and other standard form contracts.

While the other types of contracts listed have their unique features—conditional contracts rely on the occurrence of a certain event, aleatory contracts involve a certain level of risk and uncertainty, and unilateral contracts are those in which only one party makes a promise—the defining characteristic of a contract of adhesion is its take-it-or-leave-it presentation style.