From WordNet (r) 3.0 (2006) :
fax n 1: duplicator that transmits the copy by wire or radio [syn: facsimile, facsimile machine, fax] v 1: send something via a facsimile machine; "Can you fax me the report right away?" [syn: fax, telefax, facsimile]From The Free On-line Dictionary of Computing (30 December 2018) :
facsimile fax("fax") A process by which fixed graphic material including pictures, text, or images is scanned and the information converted into electrical signals which are transmitted via telephone to produce a paper copy of the graphics on the receiving fax machine. Some modems can be used to send and receive fax data. V.27 ter and V.29 protocols are used. [Details? Standards?] (2004-07-26)