memo

Etymology

Clipping of memorandum.

noun

1. A short note; a memorandum.
   According to yet another leaked memo, Powell responded the next day. Powell's leaked memo conceded that al Qaeda were not POWs, and that the Taliban individually or as a group might also lose their entitlement to that status. 2007, John Yoo, War by Other Means[…], Atlantic Monthly Press, page 42
2. (programming) A record of partial results that can be reused later without recomputation.
   The first is that the recursive call finds its subproblem solution in the memo and returns immediately. 2020, Daniel Zingaro, Algorithmic Thinking: A Problem-Based Introduction, No Starch Press, page 86

verb

1. (informal) To record something; to make a note of something.
2. (informal) To send someone a note about something, for the record.
   I made sure to memo him about the client's complaints.