Military Orders

noun a signature added to a document after it has been signed by someone else, to confirm its authenticity or to approve its contents

• The document requires the CEO to countersign before it can be considered valid.
• Hey, can you countersign this for me real quick?
• I'll sneak you in if you countersign my entry pass.
• Her smile seemed to countersign his decision to pursue his dream.

noun a written message or communication, especially one sent within an organization

adjective relating to or consisting of a memorandum

• The memorandum outlined the new company policy regarding employee benefits.
• I received a memorandum about the upcoming office party.
• Did you see the memo? It's like a super important memorandum.
• The old photograph served as a memorandum of happier times.