The electric dipole moment function for NO(X (II)-I-2) is determined by nonlinear least-squares analysis of experimental data, including previously reported (Delta upsilon = 2)/(Delta upsilon= 1) transition branching ratios for upsilon＇ less than or equal to 13. Polynomial fits to the dipole moment function are determined over the range of internuclear separation from 0.97 to 1.50 Angstrom. The fitted dipole moment functions agree well with previous ab initio predictions, but differ somewhat at the larger internuclear separations. The observed dipole moment functions are used to compute rotationless Einstein coefficients for Delta upsilon = 1-4 vibrational transitions with upsilon＇less than or equal to 20, The absolute Delta upsilon = 1 and Delta upsilon =2 Einstein coefficients are well determined by this analysis, especially for upsilon＇less than or equal to 12. The results provide a firm basis for determinations of vibration-rotation emission intensities of NO(X (II)-I-2) in high-temperature or nonequilibrium chemiexcitation systems＇.