  Quantification of entanglement is one of the most important problem in
quantum information theory. In this work, we will study this problem by
defining a physically realizable measure of entanglement for any arbitrary
dimensional bipartite system $\rho$, which we named as structured negativity
$(N_S(\rho))$. We have shown that the introduced measure satisfies the
properties of a valid entanglement monotone. We also have established an
inequality that relate negativity and the structured negativity. For $d\otimes
d$ dimensional state, we conjecture from the result obtained in this work that
negativity coincide with the structured negativity when the number of negative
eigenvalues of the partially transposed matrix is equal to $\frac{d(d-1)}{2}$.
Moreover, we proved that the structured negativity not only implementable in
the laboratory but also a better measure of entanglement in comparison to
negativity. In few cases, we obtain that structure negativity gives better
result than the lower bound of the concurrence obtained by Albeverio [Phys.
Rev. Lett. \textbf{95}, 040504 (2005)].
