تَخْصِيصُ شَيْءٍ بِشَيْءٍ بِطَرِيقٍ مَخْصُوصٍ
Restricting one thing to another by a particular form of expression.
Specification means identifying a relation while excluding relevant alternatives. Yet not every qualified or definite expression is technical qasr: the phrase “Zayd’s hand” narrows reference, but it does not by itself assert an exclusive predication.
The phrase “by a particular method” distinguishes rhetorical restriction from mere qualification. The following lessons address its expression through specific linguistic constructions; this level establishes the conceptual categories.