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semi-empirical
semi-empirical adj. 
/ˌsɛmɪɛmˈpɪrᵻkl/, /ˌsɛˌmaɪɛmˈpɪrᵻk(ə)l/, /ˌsɛmiᵻmˈpɪrᵻk(ə)l/, /ˌsɛmiɛmˈpɪrᵻk(ə)l/ that derives in part from theoretical considerations and in part from the results of experiment.
Brit. /ˌsɛmɪɪmˈpɪrᵻkl/
, /ˌsɛmɪɪmˈpɪrᵻkl//ˌsɛmɪɛmˈpɪrᵻkl/U.S. /ˌsɛˌmaɪᵻmˈpɪrᵻk(ə)l/
, /ˌsɛˌmaɪᵻmˈpɪrᵻk(ə)l//ˌsɛˌmaɪɛmˈpɪrᵻk(ə)l//ˌsɛmiᵻmˈpɪrᵻk(ə)l//ˌsɛmiɛmˈpɪrᵻk(ə)l/ΚΠ
1935 E. U. Condon & G. H. Shortley Theory Atomic Spectra i. 9 The results..were obtained in semi-empirical ways from consideration of a formulation of the theory that was only true in the limit of large quantum numbers.
1970 Nature 12 Dec. 1086/1 The Arrhenius expression is a frequently erroneous semiempirical formula, with the temperature independence of the activation energy E and the pre-exponential factor A becoming increasingly questionable as the reaction temperature range broadens.
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