As a Noun: 1. A letter or a picture of which you cause a copy to be made in a different place by inserting it inside a machine that sends information electronically along a telephone line to another machine in that different place. English = fax, facsimile. 2. A machine that sends or receives information electronically along a telephone line to or from another such machine and makes copies of letters and pictures. English = fax, fax machine, facsimile machine. As a Verb or Adjective: 1. To cause a machine to send electronic information along a telephone line about a letter or picture you insert into it to another such machine that makes a copy of it. English = fax.