a written proposal or reminder
"The manager sent a memo reminding everyone about the upcoming deadline."
A short note; a memorandum.
"The manager sent a memo to all staff reminding them of the new dress code."
In plain English: A memo is a short written message sent to people within your organization to share important information quickly.
"The manager sent out a memo reminding everyone about the new dress code policy starting Monday."
Usage: Use the noun memo as an informal abbreviation for a formal written message, such as a company-wide announcement or brief instruction. Avoid using it when referring to personal diary entries or lengthy reports that require full sentences and detailed formatting.
To record something; to make a note of something.
"The researcher will memo every observation made during the field trip."
In plain English: To memo means to send an official message to people within your own organization so they know what is happening.
"The manager decided to memo all staff about the new break times."
The word memo is a shortened form of the longer term memorandum. It entered English as a convenient abbreviation for official notes or records.