[zerognowl]

The word is usually used in the context of war. See:

https://cyberbelli.com/2012/05/26/cyberspace-is-a-domain-of-...

http://ndupress.ndu.edu/Media/News/News-Article-View/Article...

http://www.academia.edu/1753317/A_Theory_of_War_in_the_Cyber...