  We report calculations of energy levels, radiative rates, oscillator
strengths and line strengths for transitions among the lowest 345 levels of Ti
X. These include 146 levels of the $n \le$ 3 configurations and 86 of 3s$^2
4\ell$, 3s$^2 5\ell$ and 3s3p4$\ell$, plus some of the 3s$^2 6\ell$, 3p$^2
4\ell$ and 3s3p5$\ell$ levels. The general-purpose relativistic atomic
structure package ({\sc grasp}) and flexible atomic code ({\sc fac}) are
adopted for the calculations. Radiative rates, oscillator strengths and line
strengths are provided for all electric dipole (E1), magnetic dipole (M1),
electric quadrupole (E2) and magnetic quadrupole (M2) transitions among the 345
levels, although calculations have been performed for a much larger number of
levels. Comparisons are made with existing results and the accuracy of the data
is assessed. Additionally, lifetimes for all 345 levels are listed. Extensive
comparisons of lifetimes are made for the lowest 40 levels, for which
discrepancies with recent theoretical work are up to 30%. Discrepancies in
lifetimes are even larger, up to a factor of four, for higher excited levels.
Furthermore, the effect of large CI is found to be insignificant for both the
energies and lifetimes for the lowest 40 levels of Ti X which belong to the
3s$^2$3p, 3s3p$^2$, 3s$^2$3d, 3p$^3$ and 3s3p3d configurations. However, the
contribution of CI is more appreciable for the energy levels and radiative
rates among higher excited levels. Our listed energy levels are estimated to be
accurate to better than 1% (within 0.1 Ryd), whereas results for other
parameters are probably accurate to better than 20%.
