Fax is a short form of the word "facsimile," which is essentially a type of telecommunication technology that transfers printed or written information from one location to another electronically. However, there are several synonyms that can be used in place of the word "fax." Some of these synonyms include telefax, telephone fax, facsimile transmission, and fax message. Additionally, some people may refer to it simply as a "fax transmission" or "fax communication." Regardless of the term used, it remains a vital communication tool in many industries, allowing people to quickly and easily send important information from one location to another.