From Longman Business Dictionary
video-conferencingˌvideo-ˈconferencing, video-conferencing noun [uncountableU]TELECOMMUNICATIONS a system that allows a lot of people in different places to communicate with each other, using special equipment that can send sound and picturesCorporations use video-conferencing as a low-cost alternative to travelling for meetings.
—video-conference noun [countableC]The device made video-conferences practical though expensive at $1,000 an hour for the lines and $250,000 for a fully equipped room.