The term "leading-order term" refers to the most significant term in an expansion of a mathematical expression, particularly in the context of perturbation theory, asymptotic expansions, or Taylor series. It is the term that dominates the behavior of the function as certain parameters approach specific limits, often when those parameters are small or large. 1. **In Perturbation Theory**: In physics and applied mathematics, the leading-order term represents the primary effect of a small perturbation on a system.
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