DefineLaw

What is a unilateral contract?

A unilateral contract is a promise exchanged for an act, like a reward offer.

Why it matters

It binds the promisor only once the requested act is completed.

Common confusion

Unilateral = promise for act; bilateral = promise for promise.

DefineLaw editors — plain-English definitions for general reference; not a substitute for advice from a licensed attorney.

Frequently Asked Questions

When is a unilateral contract formed?

When the offeree performs the requested act.

Can the offeror revoke?

Usually until performance begins or completes, per the rules.

Is a reward a unilateral contract?

Yes — pay on completion of the requested act.

Related contract terms