Parents need to have good 'communication' with their children. [=they need to be able to understand and be understood by their children]
a 'communications satellite' [=a satellite that is used to send signals for television, radio, etc., to people around the world]
('formal') We are 'in communication' by e-mail. [=we are communicating with each other by e-mail]
(..) - Get those people outta here! - Move 'em back! Move back, folks! I sent four men down there for the boy. Report is, his eyes had turned black. Now we've lost communication with my men. What about my men? What about my men! What the hell is this? It's Bronschweig. Sir, the impossible scenario (..)1998 The X Files