Stranger

A third person; anyone who is not a party to a particular legal action or agreement.

For example, all those who are not parties to a particular contract are considered strangers to the contract.

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STRANGER, persons, contracts. This word has several significations. 1. A person born out of the United States; but in this sense the term alien is more properly applied, until he becomes naturalized. 2. A person who is not privy to an act or contract; example, he who is a stranger to the issue, shall not take advantage of the verdict. Bro. Ab. Record, pl. 3; Vin. Ab. h.t. pl. 1 and vide Com. Dig. Abatement, H 54.
     2. When a man undertakes to do a thing, and a stranger interrupts him, this is no excuse. Com. Dig. Condition, L 14. When a party undertakes that a stranger shall do a certain thing, he becomes liable as soon as the stranger refuses to perform it. Bac. Ab. Conditions, Q 4.