A memorandum is a written communication that gives information or directions. It is a notice that communicates matters concerning the business, such as policy updates, meeting or event reminders, recognition of employee performance, schedule changes, and so on. Examples of memorandum in a sentence include "I'm waiting for the memorandum that will explain the new vacation policy"and "I have endorsed a resolution on your memorandum and sent it to the committee". ^{merriam-webster.com 1 2 3 4 5}