Paying the full amount in a single payment rather than in installments; a payment method contrasted with installment payments.
クレジットカードで一括払いにすると利子はかからない場合が多い。
If you pay by credit card in a single payment, interest often isn't charged.
家電は一括払いで購入して、ポイントを多くもらった。
I bought the appliance with a lump-sum payment and got more points.
ローンではなく一括払いを選んだので支払いは楽だった。
I chose a lump-sum payment instead of a loan, so paying was easier.