noun
assumed-size aggregate
A computing term referring to a data aggregate whose size is assumed or predetermined in a given context. Rare outside technical documentation.
このアルゴリズムでは、擬寸法集合体を入力として受け取る。
This algorithm takes an assumed-size aggregate as input.
Compound of 擬 (pseudo-, quasi-), 寸法 (size, dimension), and 集合体 (aggregate, collection). A modern technical coinage, likely from computing terminology.