monthly payment; paying in monthly installments
Refers to the system or act of paying on a monthly basis, often contrasted with lump-sum or annual payments.
I signed up for this insurance with monthly payments.
It becomes a bit more expensive if you pay monthly.
Compound of 月 (tsuki, 'month') and 払い (harai, 'payment'), the nominalized form of 払う (harau, 'to pay').