noun 1. any of the parts of a debt or other sum of money to be paid at regular times over a specified period
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'installment'altered (infl. by install) < estallment < estall, to arrange payments for < OFr estaler, to stop, fix < estal, a halt, place < OHG stal: see stall2