ISI
"isi" is a 3-letter English headword indexed on PlainSpell.
The verdict
“ISI” sits in 20 confusable pairs (corpus #25,430) as a noun. The look-alike neighbours are the real trap.
- #25,430
- frequency rank, English
- 2,140
- “I” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Abbreviation of intersymbol interference.
Corpus desk
Index EN-isi · ISI · English
ISI · rank #25,430 · 0 variants · 20 confusables
- FREQ-MID #25,430
- LEN-MID 3 letters
- VOW-2 2 vowels
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 2,140
- PHOTO-FINISH ironing
Nearest frequency peer: ironing (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbours of confusable “ISI”
Peers at similar corpus weight, separate from look-alike pairs below
- IRC
IRC
74,574 corpus weight
- Irina
Irina
74,573 corpus weight
- ironing
ironing
74,572 corpus weight
- ISI
ISI
74,571 corpus weight
- itt
itt
74,570 corpus weight
- Jacobson
Jacobson
74,569 corpus weight
What this shows Bars place “ISI” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | ISI |
| Language | English |
| Part of speech | Noun |
| Letters | 3 |
| Frequency rank | #25,430 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “ISI”
Easy to mix with look-alikes
The spelling risk for ISI is neighbouring look-alikes ("it", "IV", …), not just typos; it is anoun. Frequency #25,430 among 2,140 “I” headwords. 3 recorded senses keep meaning in play.
Zero misspellings are on record for ISI in our index, which points to an orthography that plays by predictable English rules. It also participates in 20 confusable-pair relationships, "it", "IV", "iz", and more, where similar look or sound leads writers to substitute one word for another in context.
No borrowing history is documented for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is ISI, spelled I-S-I.
Definition
- 1Abbreviation of intersymbol interference.
- 2Initialism of international sensitivity index.
- 3Initialism of import substitution industrialization.
Recorded use
Wiktionary exampleThese source excerpts show how ISI appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Since ISI had been embraced by military juntas and urban interest-groups as an alternative to the oligarchic export-economy, government planners discriminated against exports by imposing heavy duties and pouring resources into manufacturing industry in preference to agriculture.
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
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "ISI", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 3 letters (nearest by frequency rank).