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Discover LudwigThe phrase "first installment" is correct and is used in written English
It is used to indicate a payment or the first part of a larger series. For example: You must pay the first installment of $500 by the end of the week.
Exact(60)
First installment.
Here's the first installment.
This is the first installment.
You can read the first installment here.
This is his first installment.
The first installment — covering Alaska and Georgia — is below.
The first installment is decidedly unpromising.
"The ecosystem" is the first installment.
The first installment gives 95% immunity.
The first installment was published last week.
The first installment appeared that year.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com