nongravitational

adjective
non·​grav·​i·​ta·​tion·​al | \ ˌnän-ˌgra-və-ˈtā-shnəl How to pronounce nongravitational (audio) , -shə-nᵊl\

Definition of nongravitational

: not of, relating to, or caused by gravitation : not gravitational Each time a periodic comet revisits the inner solar system, it can experience the gentle effects of dust-bearing gas jets erupting on its sun-warmed surface. These so-called nongravitational forces can advance or retard a comet's date of return by hours or years.— Daniel Pendick

First Known Use of nongravitational

1902, in the meaning defined above

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The first known use of nongravitational was in 1902

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