IPA: /ˈkaʊntərˌmɛmoʊ/
KK: /ˈkaʊntərˌmɛmoʊ/
A written message that responds to and disagrees with another written message.
The manager sent a countermemo to address the concerns raised in the previous memo.
Countermemo → It is formed from "counter-" (meaning against) and "memo" (from Latin "memoria", meaning memory). The word refers to a memory or note that is made against something, often used in legal or formal contexts to counter a previous memo.
Think of 'counter-' meaning against and 'memo' relating to memory — a countermemo is a note made to oppose or respond to another note.
No commonly confused words.