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]
(..) My God man. You could at least act like it was a hard decision. I intend to insist in the effort... to reestablish communication with Starfleet. However, if crew moral is better served... by my roaming the halls weeping... I would gladly defer (..)2009 Star Trek
(..) then you'll beam back to the ship. Mr. Spock, I'm leaving you in command of the Enterprise. Once we have transport capability and communication back up you'll contact Starfleet and report what the hell's going on here. And if all else fails, fall back... and rendezvous with the fleet (..)2009 Star Trek