Z√i = {m + in: m, n ∈ Z} is an integral domain under the addition defined by (m1+in1) ⊕ (m2+in2) = (m1+nm2) + i(n1+nn2) and multiplication defined by (m1+in1) ʘ (m2+in2) = (m1m2+n(-n1n2)) + i(m1n2+nn1m2). Taking nth - degree polynomials taking coefficients from the integral domain of Gaussian integers and using the residue classes modulo n operation on this integral domain, the degree of the polynomial is used to define the ordering relation and create a partially ordered set and further, defining the same addition and multiplication operations to join and meet respectively, this integral domain can be verified as the not distributive lattice.