in

/ən/

//ən// prep

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

"in" is a 2-letter English headword indexed on PlainSpell.

The verdict

“in” is in the everyday core of English, ranked #6 in English word frequency and used as a preposition.

#6
frequency rank, English
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.

Visual similarity to commonly confused words

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

in vs is
50% similar
in vs it
50% similar
in vs IV
0% similar

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

Key facts for in
PropertyValue
Headwordin
LanguageEnglish
Part of speechPreposition
IPA/ən/
Letters2
Frequency rank#6
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “in” 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). in lands here:

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

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

Spelling & Dictionary Insight

The English entry for in is 2 letters long, classified as a preposition, and transcribed in the International Phonetic Alphabet as /ən/. Corpus data places it at rank #6 in overall English word frequency, putting it firmly in the everyday core of the language. Wiktionary records 18 distinct senses for this headword, so context determines which meaning a reader should apply.

No generated misspelling entries exist for in in our index, a sign its spelling follows regular English conventions. It also participates in 20 confusable-pair relationships, "is", "it", "IV", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: PIE word *h₁en Preposition and verb from Middle English in, from Old English in, from Proto-Germanic *in. Adverb, noun and adjective from Middle English in, from Old English inn and inne, from Proto-Germanic *innai. Sense 1/2 "in"/"into" are from the origi… The correct English form is in, spelled I-N.

Definition

  1. 1
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  2. 2
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  3. 3
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  4. 4
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  5. 5
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  6. 6
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  7. 7
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  8. 8
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  9. 9
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  10. 10
    Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
  11. 11
    Into.
  12. 12
    By (doing something); indicating action causing an effect or achieving a purpose.
  13. 13
    Indicating an order or arrangement.
  14. 14
    Denoting a state of the subject.
  15. 15
    Indicates, connotatively, a place-like form of someone's (or something's) personality, as his, her or its psychic and physical characteristics.
  16. 16
    Pertaining to; with regard to.
  17. 17
    Used to indicate means, medium, format, genre, or instrumentality.
  18. 18
    Used to indicate means, medium, format, genre, or instrumentality.

Etymology

PIE word *h₁en Preposition and verb from Middle English in, from Old English in, from Proto-Germanic *in. Adverb, noun and adjective from Middle English in, from Old English inn and inne, from Proto-Germanic *innai. Sense 1/2 "in"/"into" are from the original PIE prefix, with locative/accusative case respectively. Sense 3/4 "qualification"/"means" are from the PIE metaphor of all infinitives coming from locatives.

This word in other languages

en(Español)dans(Français)in(Deutsch)em(Português)

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 "in"?
"in" is spelled I-N. The IPA pronunciation is /ən/.
What does "in" mean?
As a preposition, "in" means: Used to indicate location, inclusion, or position within spatial, temporal or abstract limits.
What words are commonly confused with "in"?
"in" is commonly confused with "is", "it", "IV". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "in"?
The IPA (International Phonetic Alphabet) transcription for "in" is /ən/. 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 "in"?
PIE word *h₁en Preposition and verb from Middle English in, from Old English in, from Proto-Germanic *in. Adverb, noun and adjective from Middle English in, from Old English inn and inne, from Proto-Germanic *innai. Sense 1/2 "in"/"into" are from... 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 “in”

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

  • The one correct English spelling is I-N - every other letter order is a misspelling in standard orthography.
  • Say it as /ən/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “is” - see the side-by-side comparison. in vs is
  • 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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list