Definitions of memorandum
a short note or document written by a lawyer and outlining the law as it relates to a particular case
My lawyer will be writing a memorandum of law regarding jurisdiction related to my case.
a short note written as a reminder about something that has to be done or acted on in the future (also: memo)
Can you put it down in a memo for me? I'll take a look at it when I get back tomorrow.
an informal message sent by one employee of a company or institution to other employees of the same institution concerning a particular aspect of that institution's business, often a message that outlines a particular policy or position on something
A leaked memo written by a top US official questions the ability of the government to control violence.