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]
(..) Mr. Creedy. And ideas are bulletproof. This is perimeter one. Whitehall is secure. Over. This is General Ackroyd. Keep communication tight. I won't have this getting any more bollixed up than it already is. V! Oh, God, we have to stop your bleeding. Please, don't. I'm finished and glad of it. (..)2005 V for Vendetta