memorandum

noun | \ ˌme-mə-ˈran-dəm \ | mem·o·ran·dum
  1. : a usually informal written communication

  1. : a record (as a note) which is used by a party seeking to enforce an otherwise oral agreement in accordance with the Statute of Frauds to prove that the other party agreed to a contract and which need not contain all the terms of the contract itself

  1. : brief

  1. : memorandum decision