Dictionary.net

A requirement for obtaining a patent. An invention is nonobvious if it would be viewed as an unexpected or surprising development by someone skilled in the technology of the particular field. For example, Babe Ruth III invents an electronic device that can signal whether a pitch is a ball or a strike. Babe's patent application is rejected on the ground that similar technology has been developed for television commentators and that Babe's invention extending these prior art developments to the game itself is obvious (in patent-speak, it "lacks nonobviousness") and is therefore not patentable.