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non-gravitational
non-gravitational adj. 
/ˌnɒnɡravᵻˈteɪʃən(ə)l/, /ˌnɒŋɡravᵻˈteɪʃn̩(ə)l/, /ˌnɒŋɡravᵻˈteɪʃən(ə)l/,
Brit. /ˌnɒnɡravᵻˈteɪʃn̩(ə)l/
, /ˌnɒnɡravᵻˈteɪʃn̩(ə)l//ˌnɒnɡravᵻˈteɪʃən(ə)l//ˌnɒŋɡravᵻˈteɪʃn̩(ə)l//ˌnɒŋɡravᵻˈteɪʃən(ə)l/U.S. /ˌnɑnˌɡrævəˈteɪʃ(ə)nəl/
/ˌnɑnˌɡrævəˈteɪʃ(ə)nəl/ΚΠ
1902 Science 7 Mar. 391/1 The recent views advanced by Lord Kelvin that the ether is imponderable or non-gravitational matter.
1992 S. P. Maran Astron. & Astrophysics Encycl. 33/1 The number of bodies in each class increases with decreasing size, until nongravitational forces (e.g., Poynting–Robertson drag, Yarkovsky effect) begin to significantly deplete the population.
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