An acquaintance and I are having a dispute and I am looking for an answer that will hopefully end the dispute. My acquaintance asserts that: There are uniform motions and non-uniform motions. Uniform motions are relative. Accelerations are absolute. Rotations are absolute. Some rotations are uniform and some are not. Non-uniform motions involve accelerations. Accelerations are not motions. Of all of those assertions, the last one is new to me. What is the "history" behind that assertion? Is it a "majority viewpoint" or a "minority viewpoint"?