Wiktionary
n. (context arts comics English) A form of art where the content is presented in a series of artistic items positioned in a specific order to convey its message or effect, such as a comic strip.
Wikipedia
Sequential art (also visual narrative, graphic narrative, pictorial narrative, sequential narrative, sequential pictorial narrative, sequential storytelling, graphic literature, or narrative illustration) is an art form that uses images deployed in sequence for graphic storytelling or to convey information. The best-known example of sequential art is comics, especially comic books and comic strips, which are a printed arrangement of art and speech balloons.
The term is also applied to other media, such as film, animation or storyboards. Scott McCloud notes in Understanding Comics that the movie roll, before it is being projected, arguably could be seen as a very slow comic.