Webster's English Dictionary

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installment

1. in.stall.ment or in.stal.ment \in-'sto.l-m*nt\ n : INSTALLATION 
2. installment also instalment n [alter. of earlier estallment payment by 
   installment, deriv. of OF est]aler to place, fix, fr. estal place, of Gmc 
   origin; akin to OHG stal place, stall 1: one of the parts into which a debt 
   is divided when payment is made at in tervals 2a: one of several parts (as 
   of a publication) presented at intervals  2b: one part of a serial story  - 
   installment aj