  Complex-linearization of a class of systems of second order ordinary
differential equations (ODEs) has already been studied with complex symmetry
analysis. Linearization of this class has been achieved earlier by complex
method, however, linearization criteria and the most general linearizable form
of such systems have not been derived yet. In this paper, it is shown that the
general linearizable form of the complex-linearizable systems of two second
order ODEs is (at most) quadratically semi-linear in the first order
derivatives of the dependent variables. Further, linearization conditions are
derived in terms of coefficients of system and their derivatives. These
linearizable 2-dimensional complex-linearizable systems of second order ODEs
are characterized here, by adopting both the real and complex procedures.
