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installment1

[in-stawl-muh nt] /ɪnˈstɔl mənt/
noun
1.
any of several parts into which a debt or other sum payable is divided for payment at successive fixed times:
to pay for furniture in monthly installments.
2.
a single portion of something furnished or issued by parts at successive times:
a magazine serial in six installments.
Origin of installment1
1725-1735
1725-35; in-2 + obsolete (e)stallment, equivalent to estall to arrange payment on an installment plan (perhaps < Anglo-French) + -ment
Related forms
reinstalment, noun

installment2

[in-stawl-muh nt] /ɪnˈstɔl mənt/
noun
1.
the act of installing.
2.
the fact of being installed; installation.
Origin
1580-90; install + -ment
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for installment

instalment1

/ɪnˈstɔːlmənt/
noun
1.
one of the portions, usually equal, into which a debt is divided for payment at specified intervals over a fixed period
2.
a portion of something that is issued, broadcast, or published in parts, such as a serial in a magazine
Word Origin
C18: from obsolete estallment, probably from Old French estaler to fix, hence to agree rate of payment, from estal something fixed, place, from Old High German stalstall1

instalment2

/ɪnˈstɔːlmənt/
noun
1.
another word for installation (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for installment
n.

"act of installing," 1580s, from install + -ment. Meaning "arrangement of payment by fixed portions at fixed times" is from 1732, alteration of Anglo-French estaler "fix payments," from Old French estal "fixed position," from Old High German stal "standing place" (see stall (n.1)). Figurative sense of "part of a whole produced in advance of the rest" is from 1823.

Online Etymology Dictionary, © 2010 Douglas Harper
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