- faxis first recorded in 1948 as a shortened form of facsimile (process, etc.) and quickly established itself in the standard language as a noun and verb during the 1980s when fax machines came into widespread use. The word has been accepted much more readily than pix (= pictures) and sox (= socks), presumably because no comfortable alternative exists, facsimile transmission being too technical and awkward for ordinary use.
Modern English usage. 2014.