noun
A discount offered under special conditions, such as for members, students, or limited-time promotions. Often seen in commercial contexts.
See also: 特割
会員には特別割引が適用されます。
A special discount applies to members.
この商品は特別割引で20%オフです。
This item is 20% off with a special discount.
Compound of 特別 (special) and 割引 (discount). The exact historical derivation is straightforward; the term is a modern commercial expression.