memorandum

American  

[mem-uh-ran-duhm] / ˌmɛm əˈræn dəm /

noun

memorandums, plural memoranda plural

1. a short note designating something to be remembered, especially something to be done or acted upon in the future; reminder.

2. a record or written statement of something.

3. an informal message, especially one sent between two or more employees of the same company, concerning company business.

   an interoffice memorandum.

4. Law. a writing, usually informal, containing the terms of a transaction.

5. Diplomacy. a summary of the state of an issue, the reasons for a decision agreed on, etc.

6. a document transferring title to goods but authorizing the return of the goods to the seller at the option of the buyer.

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memorandum British  

/ ˌmɛməˈrændəm /

noun

1. a written statement, record, or communication such as within an office

2. a note of things to be remembered

3. an informal diplomatic communication, often unsigned: often summarizing the point of view of a government

4. law a short written summary of the terms of a transaction

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Usage

Plural word for memorandum The plural form of memorandum can be either memoranda or memorandums. The plurals of several other singular words that end in -um are also formed this way, including curriculum/curricula and bacterium/bacteria. Irregular nouns whose plurals are formed like memoranda derive directly from their original pluralization in Latin. However, the standard English plural -s ending is often also acceptable for many of these terms, as in curriculums and forums.

Other Word Forms

• prememorandum
  noun

Etymology

Origin of memorandum

1400–50; late Middle English < Latin: something to be noted, noun use of neuter of memorandus, gerundive of memorāre to mention, tell

Explanation

A memorandum is a written record, message, or reminder. If your boss sends out a memorandum that there'll be a special teamwork-building workshop on Friday morning, get ready to do trust falls. Memoranda (that's the plural) are often used in diplomacy, business, and law. Two countries might sign a memorandum of understanding that they will equally share use of the river that runs between them. A member of Congress might publish a memorandum criticizing the government’s education policies. You’re probably more familiar with the word's shortened form, memo, which means the same thing but is usually used in informal contexts, such as for messages within an office.

Example Sentences

On Thursday, US officials said the two countries had agreed on a framework - known as a memorandum of understanding - pending the approval of Trump and Iran's leadership.

From BBC • May 31, 2026

The president’s physician, Navy Capt. Sean Barbabella, wrote in a memorandum released late Friday that Trump “remains in excellent health, demonstrating strong cardiac, pulmonary, neurological and overall physical function.”

From The Wall Street Journal • May 31, 2026

“Every day seems to bring another cease-fire rumor, another missile headline, another draft memorandum, another denial, and another market reversal.”

From MarketWatch • May 29, 2026

On Wednesday, Iranian state media reported elements of what they described as an unofficial draft of a 14-point memorandum of understanding.

From BBC • May 28, 2026

This memorandum would create talking points for any future discussion.

From "Long Walk to Freedom" by Nelson Mandela

Related Words

• announcement
• diary
• directive
• letter
• memo
• message
• notice