ellipsis vs litotes

ellipsis

noun
  • The omission of a word or phrase that can be inferred from the context. 

  • A mark consisting of (in English) three periods, historically or more formally with spaces in between, before, and after them, " . . . ", or, more recently, a single character, "…", used to indicate that words have been omitted in a text or that they are missing or illegible, or (in mathematics) that a pattern continues (e.g., 1, ..., 4 means 1, 2, 3, 4). 

  • The omission of scenes in a film that do not advance the plot. 

litotes

noun
  • An ironic figure of speech whereby something is stated by denying its opposite, particularly the negation of a negative quality to say something positive. 

How often have the words ellipsis and litotes occurred in a corpus of books? (source: Google Ngram Viewer )