1. to make four identical copies of something

1. existing in four identical copies

1. one of four identical copies of a document

Examples

• Please quadruplicate this form and send copies to all departments.
• The contract was prepared in quadruplicate for each party involved.
• She made quadruplicate copies of the important document.
• The application must be submitted in quadruplicate to the office.
• He kept the original and filed the quadruplicate in his records.
• The secretary was asked to quadruplicate the meeting minutes.
• All quadruplicate forms must be signed and dated.