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English definition of “third party”

third party

noun [C, usually singular]
 
 
LAW a third person or organization less directly involved in an activity or in a legal case than the main people or organizations that are involved: 30% of the units that we sell are actually sold by third parties. Shareholders may authorize a third party, such as a bank or employer, to make investments directly to their Fund accounts. In road accident cases, the plaintiff can bring a third party in as a second defendant.
INSURANCE in an insurance contract, a person who is not the insurance company or the insured person, but who will receive money if they suffer loss or damage caused by the insured person: The policyholder is covered if they cause injury or damage to a third party.
(Definition of third party noun from the Cambridge Business English Dictionary © Cambridge University Press)
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