A screen is a flat surface on which images are shown. In these sentences, the word "screen" is a noun:
You’ll wreck your eyes if you sit too closely to a TV screen.
Television screens are measured diagonally.
The TV screen in my basement measures 60 inches.
Movie screens in movie theaters are large enough for hundreds of people to watch a movie at the same time.
Our classroom has a pull-down screen that’s fastened to the ceiling.
A computer screen casts light on the person who sits in front of it.
Mobile devices have small five or six-inch screens.
Parents should think about how much screen time their kids are getting every day. (screen time = the amount of time that a person sits in front of a computer, iPad, or television)
Video gamers can quickly rack up several hours of screen time every day. (gamer = a person who plays video games)
You can get a screen shot of your computer screen by holding down the shift key + command + 4 and then drawing your cursor over the area to be captured.
He’s sitting in front of a computer screen.
When the word "screen" is used as a verb, it means to filter, monitor, or block a thing or person who may want to contact you.
We screen incoming phone calls with an answering machine.
Airline passengers are screened to make sure they aren’t carrying weapons.
Phone calls to radio programs are screened for callers who want to make comments on a live broadcast.
Resumes are screened by employers who are looking for qualified applicants to interview for a job.
A screen door allows fresh air into your house while keeping bugs and insects out.
Homeowners plant trees in their yard to screen their view of something unpleasant like a highway or an ugly building.