Which term is synonymous with sending a facsimile?

The term synonymous with sending a facsimile is "fax." A fax refers specifically to the technology and process of transmitting a scanned document over a telephone line or internet connection, allowing documents to be sent quickly and efficiently as an electronic reproduction.

In this context, "fax" directly relates to the act of sending a facsimile, making it the correct term. Understanding the function of a fax machine or service emphasizes how it captures a document and sends it as a replica, consistent with the definition of a facsimile, which means an exact copy.

The other terms, while related to communication and document handling, do not specifically denote the act of sending a facsimile. "Transmit" is a broader term that can refer to sending various types of information, "photocopy" specifically means creating a paper duplicate of a document, and "message" is a general term for information conveyed but does not imply the method of transmission associated with facsimiles.