There are multiple definitions - click on the translation that matches your context.
party means:
parte (de um contrato) means:
substantivo
full
noun
In Brazil, the parties to a contract are usually referred to as "contratante" and "contratada". For translation suggestions, please see the respective word cards. Translation tip: When referring to a "parte do contrato", one should use the preposition "to" (e.g., He is a party to the lease agreement).
a person involved in a suit, dispute resolution proceedings or (less commonly) a prosecution
This version of events is clearly designed to cast Mr Mendelsohn as the innocent party.
a person taking part in a business transaction, negotiating a contract, bound by a contract etc
It was in the best interests of both parties to terminate the contract.