
1) Roman citadel
Found on
https://www.crosswordclues.com/clue/arx

Latin, meaning: arcis citadel, stronghold, fortress, keep, dungeon
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http://archives.nd.edu/aaa.htm

A decorative swan display in Phipps Conservatory`s Sunken Garden during the 2005 Winter Flower Show. ...
Found on
http://en.wikipedia.org/wiki/ARX
[operating system] ARX was a Mach-like operating system written in Modula-2+ developed by Acorn Computers Ltd in the Acorn Research Centre (ARC) UK and later Olivetti Research Center and later on Software Technology Laboratory (when Olivetti bought out Acorn) at Palo Alto for their new ARM RISC processors based Archimedes computers range. A...
Found on
http://en.wikipedia.org/wiki/ARX_(operating_system)
[revision control] ArX is a distributed revision control system. ArX began as a fork of GNU arch, and is licensed under the GPL. Since the fork, ArX has been extensively rewritten in C++, with many new features. The project maintainer is Walter Landry. == History == Landry was for a short time the maintainer of Arch, and forked ArX when Tom...
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http://en.wikipedia.org/wiki/ArX_(revision_control)
[Roman] Arx is a Latin word meaning `citadel`. In the ancient city of Rome, the arx was located on the northern spur of the Capitoline Hill, and is sometimes specified as the Arx Capitolina. ==History== At Rome, sentries were traditionally posted on the Arx to watch for signals displayed on the Janiculum if an enemy approached. A red flag w...
Found on
http://en.wikipedia.org/wiki/Arx_(Roman)

Fortress.
Found on
http://www.encyclo.co.uk/local/20764

The citadel of Rome, on the Capitol. Also a fortress.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.