A sentence word (also called a one-word sentence) is a single word that forms a full sentence.
Henry Sweet described sentence words as 'an area under one's control' and gave words such as "Come!", "John!", "Alas!", "Yes." and "No." as examples of sentence words.[1] The Dutch linguist J. M. Hoogvliet described sentence words as "volzinwoorden".[2] They were also noted in 1891 by Georg von der Gabelentz, whose observations were extensively elaborated by Hoogvliet in 1903; he does not list "Yes." and "No." as sentence words. Wegener called sentence words "Wortsätze".[3]