We present a consistent scaling framework in which MOND’s acceleration scale a_0 ∼ 10^(−10) m/s^2 arises from vacuum entanglement gradientsassociated with the de Sitter horizon of the cosmological constant Λ (assumed constant and spatially uniform). Baryonic matter perturbs localentanglement structure, inducing an entropic restoring force that becomes dominant below a critical scale set by Λ. In the deep-MOND regime, thisyields the scaling a ∼√(a_0a_N, reproducing flat rotation curves without dark-matter halos. The framework connects to Gibbons—Hawking temperature,Unruh acceleration, and entropic gravity. Environment-dependent effects may enhance the growth rate of early structure formation and contributeto Hubble tension. A distinguishing prediction is scale-dependent enhancement of structure growth in void environments, leading to a fractionaldeviation of order ∼10—15% in void expansion rates relative to ΛCDM expectations, potentially testable with next-generation void surveys (e.g., DESI, Euclid). Relativistic completion is required; preliminary mapping to TeVeS-like scalar is discussed. This should be viewed as aneffective description capturing a possible thermodynamic origin of MOND phenomenology.