olemus
(1) üks mitmest serverprogrammist samal arvutil, vastandina paiknemisele eraldi arvutitel
= one of several server programs on the same computer, as opposed to being located on separate computers
(2) ühe serverina käsitletav kohalik või hajus serverite rühm halduse ja/või koormusejaotuse õlbustuseks
= a local or distributed group of servers treated as a single server for management and/or load balancing purposes

ülevaateid
https://www.techopedia.com/definition/27139/virtual-server
https://en.wikipedia.org/wiki/Virtual_server