This work presents a complete, rigorous, and self-contained extension of the entire apparatus of Meta-Operational Mathematics---the hierarchical theory of operations acting upon operations---to the class of Abelian functions of arbitrary genus $g\ge 1$ and their inverses. The central philosophical principle remains unchanged: operations upon operations constitute the natural generalization of operations upon numbers, and this principle is established with complete mathematical precision through a hierarchical framework of four ascending levels---elements, operations, meta-operations, and meta-meta-operations. The fundamental geometric object is a principally polarized Abelian variety $\Sigma_g = \mathbb{C}^g/\Lambda$, where $\Lambda = \Omega\mathbb{Z}^g+\mathbb{Z}^g$ is a full-rank lattice of rank $2g$ with period matrix $\Omega\in\mathbb{H}_g$. The primary generating operation is the Riemann theta function $\theta(z;\Omega)$ and its logarithmic derivatives, the generalized Weierstrass functions $\wp_{ij}(z) = -\frac{\partial^2}{\partial z_i\partial z_j}\log\theta(z;\Omega)$, which together generate the entire field of Abelian functions. The inverses of Abelian functions are defined by the solution of the Jacobi inversion problem and are formulated as meta-operations via the operadic implicit function theorem. A fundamental and systematic distinction from the elliptic case is established throughout: the multi-periodicity with $2g$ independent real periods replaces the double periodicity of genus one, leading to the \textbf{Abelian Duality Axiom} (Axiom~2.26), which replaces the quotient group $(\mathbb{C},+)$ by $(\mathbb{C}^g/\Lambda,+)$. This crucial modification, together with the higher-dimensional divisor structure $\Theta=\{\theta(z)=0\}$ of complex codimension one, permeates the entire theory. A second essential feature is the intrinsic connection to the theory of algebraically completely integrable systems via the Krichever correspondence: Baker-Akhiezer functions become concrete meta-operations, Hirota bilinear identities become operadic cocycle conditions, and the KP hierarchy is realized as commutation relations within the Abelian operad. The paper develops the full meta-operational framework in complete analogy to the elliptic case, with every definition, theorem, and proof carried out at the same or higher level of detail. The Abelian operad $\mathbf{Ab}_g$ is constructed, endowed with a complete Hopf operad structure, and connected to the Connes-Kreimer renormalization Hopf algebra via an explicit morphism. Bornological convergence is systematically generalized to the multi-cylindrical setting that avoids the theta divisor, and the path integral trace is reinterpreted as an operadic trace on $\mathbf{Ab}_g$. Applications to noncommutative Abelian geometry, topological quantum field theory on Abelian surfaces, and the spectrum of topological modular forms of higher genus are developed. Several open problems are resolved as theorems within this framework.