Memorandum (noun)

A written reminder or record of something, especially a matter for future attention.

Origin:

Late middle english (denoting a reminder or note): from latin memorandum est "it must be remembered".

Examples:

1. The chairman circulated a memorandum outlining the proposals for the restructuring of the company.
2. I received a memorandum from my boss instructing me to attend an important meeting tomorrow.
3. The memorandum included a detailed explanation of the new policies and procedures.
4. Please send me a memorandum with the main points discussed at the meeting.
5. A memorandum of understanding was signed between the two countries to enhance cooperation in various fields.