noun
fixed-amount savings; fixed deposit
A type of savings account where a fixed amount is deposited regularly, often associated with postal savings in Japan.
毎月の定額貯金で、少しずつ旅行資金をためています。
I'm saving up travel funds little by little with a monthly fixed-amount savings plan.
定期預金 is a time deposit with a fixed term and interest rate, while 定額貯金 is a fixed-amount savings plan often without a set maturity date.
Compound of 定額 (fixed amount) and 貯金 (savings).