1a showing of a film, video, or television programme:filmgoers were shut out in droves from the film’s many screenings in Cannes [mass noun]:the less-than-successful screening of the sitcom’s pilot episode
2 [mass noun] the evaluation or investigation of something as part of a methodical survey, to assess suitability for a particular role or purpose:nowhere is drug screening more common than in the federal criminal justice system
3the testing of a person or group of people for the presence of a disease or other condition:prenatal screening for Down’s syndrome
4 (screenings) refuse separated by sieving grain.
screening in other Oxford dictionaries
Definition of screening in the US English dictionary