<p dir="ltr"><b>Abstract</b></p><p dir="ltr">Based on two first principles newly introduced here—the <b>Causal–Entropic Law (CEL)</b> and the <b>Principle of Selective Entropy Increase (SEI)</b>—we construct <b>Order Dynamics (OD)</b>, a unifying framework for explaining the origin and evolution of cosmic order. OD posits that cosmic dynamics arise from the interplay of two fundamental forces: a <i>Causal Force</i>, which drives aggregation, structure, and causal coherence; and an <i>Entropic Force</i>, which drives dispersion, disintegration, and disorder. Their asymmetric competition underlies the emergence of complexity from the Big Bang to multi-level systems.</p><p dir="ltr">Within this framework, longstanding puzzles such as <b>singularities, mass, inertia, the arrow of time, the light-speed limit, spacetime curvature</b>, and other foundational paradoxes are reinterpreted as manifestations of causal–entropic dynamics.<br>Building on the CEL, OD further predicts a <b>fundamental</b><b> physical state of matter—the Semi-Aggregated State (SAS)</b>, an intermediate phase between particle and field. The SAS framework provides a coherent, physical basis for several quantum phenomena, offering self-consistent explanations for <b>wave–particle duality, quantum entanglement, and the uncertainty principle</b>, while grounding the <b>wavefunction</b> as a physically real expression of a semi-condensed field distribution.</p><p dir="ltr">Extending beyond physics, OD naturally encompasses biological evolution, social systems, and civilizations as progressive emergences of order across scales. As a conceptual paradigm, OD seeks not to replace existing theories but to subsume and extend them—pointing toward new empirical directions for probing the origins of complexity and the fundamental laws of nature.</p><p dir="ltr"><a href="" target="_blank"><b>Keywords:</b></a></p><p dir="ltr">Order Dynamics (OD); Causal–Entropic Law (CEL); Selective Entropy Increase (SEI); Semi-Aggregated State (SAS); Entropy; Causality; Quantum Mechanics; Complexity; Cosmology; Spacetime, Particle Physics.</p>