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]
(..) something measurable in the biology of the forest. Which is what, exactly? What we think we know is that there is some kind of electrochemical communication between the roots of the trees, like the synapses between neurons. And each tree has ten-to-the-fourth connections to the trees around it. (..)2009 Avatar