A more thorough explanation:

A unilateral act is an action or deed performed by only one party, without the involvement or consent of any other party. It is a voluntary action that is taken by an individual or organization, without any external influence or pressure.

Examples of unilateral acts include:

• A person making a will, which is a legal document that outlines how their assets will be distributed after their death.
• An individual exercising a power of appointment, which is the right to designate who will receive property or assets.
• A party voiding a voidable contract, which is a contract that can be legally cancelled by one party.

These examples illustrate the definition of a unilateral act because they involve only one party making a decision or taking an action, without any input or agreement from another party. The decision or action is made solely by the individual or organization, and is not influenced by any external factors.