"by installment" is correct and usable in written English.
You can use this phrase to refer to something purchased in multiple payments over time, for example, "I bought a new car by installment."
The bank's loan business is dominated by installment loans.
Serial books are also in the offing and will be priced by installment.
A trend toward allowing payment by installment is also helping women decide to invest in advanced business education, Ms. Bournard said.
The decade witnessed an explosion in sales of cars and radios, refrigerators and washing machines, all made affordable by installment plans.
In the Netherlands, by contrast, Mr. Greene said the Amsterdam school had not seen any increase in families paying fees by installment.
Southern and Hoffenberg, writing under the joint name of Maxwell Kenton, were happy to sell their "gallant little novel," as Girodias called it, for a few hundred dollars, to be paid by installment as the chapters were delivered.
The failure of Mr. King's electronic novel-by-installment should be taken as a healthy sign that real books and real readers will always be with us.
Thanks to the pay-by-installment plan popularized by I.M. Singer, many had access to a treadle machine that quickly finished essential sewing, leaving time for more leisurely pursuits like embroidery and quilting.
The contrast is that between instantaneous death and death by installments -- caused by electric shocks administered after one or more intervening periods of complete consciousness of the victim.
Amortization: The gradual repayment of a mortgage by installments, calculated to pay off the principal at the end of a fixed period of time.
The first, devoted to Shakespeare and the connections between classical and modern theater, was to be followed by installments on theater in Ireland and the United States.
