1. [n]  duplicator that transmits the copy by wire or radio
2. [n]  an exact copy or reproduction
3. [v]  send something via a facsimile machine; "Can you fax me the report right away?"

1. \Fac*sim"i*le\, n.; pl. {Facsimiles} (-l?z). [L. fac
   simile make like; or an abbreviation of factum simile made
   like; facere to make + similes like. See {Fact}, and
   {Simile}.]
   A copy of anything made, either so as to be deceptive or so
   as to give every part and detail of the original; an exact
   copy or likeness.
   {Facsimile telegraph}, a telegraphic apparatus reproducing
      messages in autograph.
   

2. \Fac*sim"i*le\,, v. t.
   To make a facsimile of.
   

("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.