installment

/ɪnˈstɔːl.mənt/

//ɪnˈstɔːl.mənt// noun

By · According to Wiktionary data (CC BY-SA) ·

"installment" is a 11-letter English headword indexed on PlainSpell.

The verdict

“installment” has 15 generated spelling variants in the English index at frequency #13,369. The variants make it a useful spelling check.

#13,369
frequency rank, English
17,902
“I” headwords
15
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

installment vs instalment
91% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for installment
PropertyValue
Headwordinstallment
LanguageEnglish
Part of speechNoun
IPA/ɪnˈstɔːl.mənt/
Letters11
Frequency rank#13,369
Misspellings tracked15
Confusable pairs1
SourceWiktionary (kaikki.org)

Where “installment” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). installment lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 15 spelling variants around installment (IPA /ɪnˈstɔːl.mənt/), anoun. Corpus frequency is #13,369 among 17,902 “I” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

Our generated misspelling index lists 15 likely wrong-spelling variants for installment, with forms such as "innstallment", "insatllment", and "insstallment". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 1 confusable-pair relationship, "instalment", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: A 1732 alteration of estallment, from Anglo-Norman estaler (“fix payments”), from Old French estal (“fixed position”), from Old High German stal (“stall", "standing place”) The sense of "part of a whole produced in advance of the rest" is from 1823. The correct English form is installment, spelled I-N-S-T-A-L-L-M-E-N-T.

Definition

  1. 1
    One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval.
  2. 2
    Any of a series of portions of a debt or sum of money, which portions may or may not be equal in amount (depending in part on whether the interest rate is fixed or variable), and payment of which takes place at regular intervals toward satisfaction of the total. Payments are generally mensual, quarterly, triannual, biannual, or annual.
  3. 3
    A part of a published or broadcast serial.

Etymology

A 1732 alteration of estallment, from Anglo-Norman estaler (“fix payments”), from Old French estal (“fixed position”), from Old High German stal (“stall", "standing place”) The sense of "part of a whole produced in advance of the rest" is from 1823.

Synonyms

episodepart

This word in other languages

cuota(Español)au fur et à mesure(Français)Rate(Deutsch)episódio(Português)

Common misspellings

Also misspelled as:

  • innstallment
  • insatllment
  • insstallment
  • installemnt
  • installmennt
  • installmentt
  • installmetn
  • installmment
  • installmnet
  • instalmlent
  • instlalment
  • insttallment
  • intsallment
  • isntallment
  • nistallment

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of installment - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

innstallment1insatllment2insstallment1installemnt2installmennt1installmentt1installmetn2installmment1
Edit distance from "installment"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "installment"?
"installment" is spelled I-N-S-T-A-L-L-M-E-N-T. The IPA pronunciation is /ɪnˈstɔːl.mənt/.
What does "installment" mean?
As a noun, "installment" means: One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval.
What words are commonly confused with "installment"?
"installment" is commonly confused with "instalment". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "installment"?
The IPA (International Phonetic Alphabet) transcription for "installment" is /ɪnˈstɔːl.mənt/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "installment"?
A 1732 alteration of estallment, from Anglo-Norman estaler (“fix payments”), from Old French estal (“fixed position”), from Old High German stal (“stall", "standing place”) The sense of "part of a whole produced in advance of the rest" is from 1823. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “installment”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is I-N-S-T-A-L-L-M-E-N-T - every other letter order is a misspelling in standard orthography.
  • Say it as /ɪnˈstɔːl.mənt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “instalment” - see the side-by-side comparison. installment vs instalment
  • Browse more English words and confusable pairs in the same reference. English words

Same frequency band

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list