non-relativistic
/ˌnɒnrɛlətɪˈvɪstɪk/adjective
That is not relativistic; (Physics ) not based on or involving the theory of relativity; characterized by circumstances in which the discrepancies between the predictions of the theory of relativity and of classical physics are negligible.
Origin
Early 20th century; earliest use found in Journal of Philosophical, Psychological and Scientific Methods. From non- + relativistic.