noun
An experience of something in advance.
(colloquial) An advance showing of a film, exhibition etc.
A short collection of clips edited together to advertise a film, television show, etc.; a trailer.
Something seen in advance.
(computing) A facility for viewing and checking a document or photo, or changes to it, before saving or printing it.
verb
(transitive) To show or watch something, or part of it, before it is complete.
(computing, transitive) To show something in advance, a facility for viewing and checking a document or photo, or changes to it, before saving or printing it.