A program that provides and manages access over the web to a collection of websites; (also) a computer or computer system running a program of this kind, especially one on which the websites themselves are stored.
Origin
1990s; earliest use found in Computer Shopper.
Definition of web server in US English:
web server
noun
A program that provides and manages access over the web to a collection of websites; (also) a computer or computer system running a program of this kind, especially one on which the websites themselves are stored.