fi
/fiː/noun, preposition
fi is spelled F-I: 2 letters and one syllable. It appears 18 times per million words in written English, the 4,589th most frequent word form (wordfreq, 2021 data, counting Fi, the name). As a noun, fi means “The solfeggio syllable used to indicate the sharp of the fourth note of a major scale” (English Wiktionary, September 2026).
How many letters and syllables are in fi?
| Letters | 2: F-I |
|---|---|
| Syllables | 1 (from its American pronunciation) |
| In writing | 18 times per million words; the 4,589th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is fi?
Fi appears 18 times per million words in written English, the 4,589th most frequent word form in the list. The list counts every capitalisation together, so this includes Fi, the name.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce fi?
- /fiː/
- /faɪ/
Fi has one syllable (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Words people confuse with fi
Also written: to.
Sources: English Wiktionary (homophones, alternative spellings).
What does fi mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The solfeggio syllable used to indicate the sharp of the fourth note of a major scale.
- 2
Abbreviation of fidelity (e.g. in hi-fi, lo-fi, or wi-fi).
- 3
Abbreviation of fiction (e.g. in sci-fi).
noun
- 1
Abbreviation of factor I (clotting factor I).
- 2
Initialism of field interview/interrogation.
- 3
Initialism of fuel injection.
- 4
Initialism of fault indicator.
preposition
- 1
Alternative form of to.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).