apparatus that makes copies of typed, written or drawn material
"The office manager sent me to the copier to get a fresh set of contracts for the meeting."
A machine that copies graphical material; a duplicator.
"The office worker used the copier to make fifty extra copies of the meeting agenda before distributing them."
In plain English: A copier is a machine that makes copies of documents by scanning them and printing new ones on paper.
"I need to make copies before I leave for my meeting, so I walked over to use the copier in the breakroom."
Usage: Use this term to refer specifically to the office machine used for reproducing documents or images, rather than general copying actions which use verbs like copy or duplicate. It is often confused with "photocopier," but both terms describe the same device in everyday contexts.
From copy + -er.