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]
(..) I don't know. And I wish that I did. But there's no way for me to contact my operatives inside the Capitol. The Capitol has always suppressed communication between the districts. But I know their system very well. I managed to break through. All we need now is the perfect message. (..)2014 The Hunger Games: Mockingjay - Part 1