What webmaster means
The word combines web and master. Merriam-Webster defines it as a person responsible for the creation or maintenance of a website, especially for a company or organisation, and dates its first known use to 1993. The German Duden lists it as someone in charge of creating, organising and maintaining websites. The Spanish dictionary of the Real Academia Española does not include it.
The term also has a technical use. RFC 2142, from May 1997, sets webmaster@ followed by the domain as the mailbox that receives queries and reports about an organisation's web service, just as postmaster@ does for email. It accepts www@ as a synonym.