infinity
/ɪnˈfɪnɪti/
"infinity" is a 8-letter English headword indexed on PlainSpell.
The verdict
“infinity” is a regularly-used English word, ranked #9,350 in English word frequency and used as a noun.
- #9,350
- frequency rank, English
- 8
- letters
- 12
- tracked misspellings
- 4
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - endlessness, unlimitedness, absence of a beginning, end or limits to size.
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 | infinity |
| Language | English |
| Part of speech | Noun |
| IPA | /ɪnˈfɪnɪti/ |
| Letters | 8 |
| Frequency rank | #9,350 |
| Misspellings tracked | 12 |
| Confusable pairs | 4 |
| Source | Wiktionary (kaikki.org) |
Where “infinity” sits in English frequency
Spelling & Dictionary Insight
The English entry for infinity is 8 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ɪnˈfɪnɪti/. Corpus data places it at rank #9,350 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 5 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 12 likely wrong-spelling variants for infinity, with forms such as "ifninity", "inffinity", and "infiinty". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 4 confusable-pair relationships, "insanity", "infinite", "indignity", and more, where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Middle English infinite, from Old French infinité, from Latin īnfīnitās (“unlimitedness”), from negative prefix in- (“not”), + fīnis (“end”), + noun of state suffix -tās. The correct English form is infinity, spelled I-N-F-I-N-I-T-Y.
Definition
- 1endlessness, unlimitedness, absence of a beginning, end or limits to size.
- 2A number that has an infinite numerical value that cannot be counted.
- 3An idealised point which is said to be approached by sequences of values whose magnitudes increase without bound.
- 4A number which is very large compared to some characteristic number. For example, in optics, an object which is much further away than the focal length of a lens is said to be "at infinity", as the distance of the image from the lens varies very little as the distance increases further.
- 5The symbol ∞.
Etymology
From Middle English infinite, from Old French infinité, from Latin īnfīnitās (“unlimitedness”), from negative prefix in- (“not”), + fīnis (“end”), + noun of state suffix -tās.
Synonyms
Antonyms
This word in other languages
Common misspellings
Also misspelled as: ifninity,inffinity,infiinty,infinitty,infinityy,infiniyt,infinnity,infintiy,infniity,inifnity,innfinity,nifinity
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of infinity - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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 "infinity"?
What does "infinity" mean?
What words are commonly confused with "infinity"?
How do you pronounce "infinity"?
What is the origin of the word "infinity"?
Is PlainSpell free to use?
Using “infinity”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-N-F-I-N-I-T-Y - every other letter order is a misspelling in standard orthography.
- Say it as /ɪnˈfɪnɪti/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “insanity” - see the side-by-side comparison. infinity vs insanity
- Browse more English words and confusable pairs in the same reference. English words
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.