A mandate agreement is a formal document that outlines the terms and conditions of an agreement between two parties. If you're looking for synonyms for the word "mandate agreement", some options include: contract, legal agreement, arrangement, covenant, pledge, commitment, and understanding. These synonyms can be used interchangeably in many contexts, such as business agreements, legal contracts, and even personal agreements between friends or family members. So, if you're looking to add some variety to your vocabulary when it comes to describing formal agreements, consider using any of the synonyms above to add a fresh perspective to your writing.