memo UK /ˈmɛməʊ̯/US /ˈmɛmoʊ̯/noun 2verb 2forms 3phrases 2 noun2 •A short note; a memorandum. •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 verb2 •(informal) To send someone a note about something, for the record.I made sure to memo him about the client's complaints. •(informal) To record something; to make a note of something. formsmemoed · memoing · memos Phrases with memo get the memoTo receive an item of information. miss the memoTo be unaware of the current state of affairs.