a business agreement in which people trust each other without a written contract The shipment will arrive first before December, in accordance with our agreement. Per means, so you can actually say “according to our agreement, you must…” ». As in your first sentence, it`s pleonastic and it looks affected: I would avoid it. The very frequent “as usual” is a humorous prolixity. an agreement in which two people or groups each promise to do something My question is what is, if ever, the functional and syntactic difference between how and per. If there are no differences, what should I use? a formal agreement, especially in economics or politics If you have a lawyer, the IME is provided for by agreement between the insurance company and your lawyer. .  In accordance with the working agreement between the teams, the Major League club paid Toronto for the rights of each Maple Leafs player it had called: $25,000 under current conditions) for the first player and $5,000 currently) for each player after. Formal agreement, often an agreement that people meet in secret In 2005, Bougainville voters elected their own parliament, as was decided in 2003. an implicit agreement between citizens and the government on the rights and duties of each group that confers legitimacy on a government an agreement by which one party promises something, but the other does not enter into an informal agreement or not expressed in words It goes without saying that any statement you make is “without your knowledge” or “to your knowledge”, unless otherwise stated. Which could be the case.