Purposeful omission is the leaving out of particular nonessential details that can be assumed by the reader (if used in literature), according to the context and attitudes/gestures made by the characters in the stories.
It allows for the reader to make their own abstract representation of the situation at hand.
[1] In the book Why We Fought: America's Wars in Film and History, author Peter Rollins mentions that war movies in the US have purposely omitted some facts so as to make it acceptable to the Pentagon.
], purposeful omissions are allowed to carry out the law in spirit and action.
[4] In the context of technology, the term is used to denote the avoidance of unwanted or unnecessary feedback.