What does Paul mean by 'communicate' when he uses that word in Galatians?
In Galatians, communicate means to expound thoroughly, leaving no stone unturned so the truth is clearly understood. It stresses detailed, complete instruction, as when Priscilla and Aquila communicated the way of God more perfectly to Apollos, explaining everything they had learned from Paul.
Les teaches that the word communicate, which Paul likes to use back in Galatians, means you leave no stone unturned so that it is clearly understood. He connects it with expounding detail by detail, as Priscilla and Aquila communicated or expounded unto Apollos the way of God more perfectly or more completely. Les explains that they were telling him everything they had learned from Paul—that the cross now made all the difference, that they were no longer under the kingdom economy, the law, or temple worship, because Christ had died, been buried, and risen from the dead. Thus communicate means thorough, complete explanation that makes the truth clear.