Pro forma invoice is a term commonly used in the field of finance and trade to refer to a document that is typically issued by a seller to a buyer prior to a transaction taking place. The document outlines the details of the transaction, including the goods or services being sold, their price, and any other relevant information. Synonyms for the term "pro forma invoice" include "pretend invoice," "dummy invoice," and "prior invoice." Other similar terms that may be used interchangeably with pro forma invoice include "quotation," "estimate," and "price quote," all of which refer to documents that provide information about pricing and other relevant details prior to a transaction taking place.