Under which condition can acceptance be considered valid despite a lack of communication?

Acceptance can be considered valid despite a lack of communication when the offeror explicitly waives the requirement for communication. In contract law, the general principle holds that acceptance must be communicated to the offeror to create a binding agreement. However, if the offeror indicates that communication of acceptance is unnecessary, either through express terms or by actions that imply such waiver, acceptance can occur without the need to notify the offeror.

This situation often arises in unilateral contracts, where one party makes a promise in exchange for an act. If the offeror has stated that performance of the act itself constitutes acceptance and has removed the need for any formal communication, the acceptance is valid once the offeree has performed the act.

In contrast, scenarios such as an offer made verbally or in writing, or when the offeror does not specify a communication method, do not inherently allow acceptance to occur without communication. Thus, they lack the explicit waiver by the offeror that would make acceptance valid under those circumstances.