Most dictionaries define the fourth dimcnsmn as time, however, some military writings refer to a fourth dimension of military endeavor beyond the three traditional ones of sea, air and land. That dimension is the electromagnetic spectrum. The two concepts rnay, at first glance appear to have little in common with each other but, in fact, they are closely related. The battle for the electromagnetic spectrum is, in many respects, a battle for time.
Thomas, G. Guy
"Warfare in the Fourth Dimension-ls the Navy Ready for it?,"
Naval War College Review: Vol. 36
, Article 2.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol36/iss1/2