A growing number of them have stopped paying for cable and satellite TV service, and don’t even use an antenna to get free signals over the air. These people are watching shows and movies on the Internet, sometimes via cellphone connections. Last month, the Nielsen Co. started labeling people in this group “Zero TV” households, because they fall outside the traditional definition of a TV home. There are 5 million of these residences in the U.S., up from 2 million in 2007…

Zero TVers tend to be younger, single and without children. Nielsen’s senior vice president of insights, Dounia Turrill, says part of the new monitoring regime is meant to help determine whether they’ll change their behavior over time. “As these homes change life stage, what will happen to them?”…

The TV industry has a host of buzz words to describe these non-traditionalist viewers. There are “cord-cutters,” who stop paying for TV completely, and make do with online video and sometimes an antenna. There are “cord-shavers,” who reduce the number of channels they subscribe to, or the number of rooms pay TV is in, to save money.

Then there are the “cord-nevers,” young people who move out on their own and never set up a landline phone connection or a TV subscription. They usually make do with a broadband Internet connection, a computer, a cellphone and possibly a TV set that is not hooked up the traditional way.