The Collaborative International Dictionary
communicational
communicational \communicational\ adj. used in communication; as, he had few communicational grooves available for use.
Wiktionary
communicational
a. 1 That communicates 2 Relating to communications
WordNet
communicational
adj. used in communication; "he had few communicational grooves available for use"
Usage examples of "communicational".
Giles didn't expect it to be immediate, of course - the envoys would take decades to reach the closest systems they'd been assigned to, and there'd still be the communicational timelag to take into consideration.