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Back-formation (or back formation or backformation) is a term that describes the way certain words are formed.
Back-formation from orientation: this might not be how the first instance of the verb was formed, but I'm quite sure it can play a role for people's preferences.
News 7 Jan. 2 To have an eye to its [the book's] merits rather than to its defects, is obviously log-rolling. log-roll, v. [Back-formation from LOG-ROLLING.] a. trans.