Nonmoving

Nonmoving is an adjective meaning not moving; at rest; stationary or immobile. It is formed from the prefix non- combined with moving. In American English it is commonly written as a single word (nonmoving), though hyphenated (non-moving) is also used, and some style guides prefer the hyphen in formal writing.

In physics, an object is described as nonmoving when its velocity is zero relative to a chosen frame of reference. The term is relative; an object that is nonmoving in one frame can be moving in another. For example, a train at rest relative to the platform is nonmoving to an observer on the platform but moving to an observer inside the train. Zero velocity indicates nonmovement, while nonmovement does not imply the absence of forces acting on the object.

In everyday language, nonmoving is less common than stationary or still, but it appears in technical and descriptive contexts where emphasis on lack of motion is desired. The term can also appear in specialized fields such as computer vision and robotics, where nonmoving frames or regions denote a lack of change between successive images or sensor readings, aiding tasks like motion detection and background subtraction.

Overall, nonmoving conveys the state of having no motion relative to a reference frame and is typically used in more formal or technical writing. See also rest, motion, velocity, inertia, and stationary.