memorandum
Pronunciation: /mɛməˈrandəm/
noun ( plural memoranda /-də/ or memorandums)
- a written message in business or diplomacy: he told them of his decision in a memorandum
- a note recording something for future use: the two countries signed a memorandum of understanding on economic cooperation
- Law a document recording the terms of a contract or other legal details: articles of association must be signed by subscribers to the memorandum

Origin:
late Middle English: from Latin, literally 'something to be brought to mind', gerundive of memorare. The original use was as an adjective, placed at the head of a note of a record made for future reference

Spelling help
The plural of memorandum can be spelled either memorandums or memoranda (like the original Latin).