noun
required reserves; legal required reserves
A banking term referring to the minimum reserves a financial institution must hold as mandated by law or regulation.
銀行は法定準備預金を中央銀行に預けなければならない。
Banks must deposit required reserves with the central bank.
Compound of 法定 (legal, statutory) + 準備 (preparation, reserve) + 預金 (deposit). A straightforward technical term with no obscure historical derivation.