si

\si\

/\si\/ conj

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

The verdict

“si” is in the everyday core of French, ranked #46 in French word frequency and used as a conjunction.

#46
frequency rank, French
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.

Visual similarity to commonly confused words

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

si vs st
50% similar
si vs su
50% similar
si vs so
50% similar

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

Key facts for si
PropertyValue
Headwordsi
LanguageFrench
Part of speechConjunction
IPA\si\
Letters2
Frequency rank#46
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “si” sits in French 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). si 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 French entry for si is 2 letters long, classified as a conjunction, and transcribed in the International Phonetic Alphabet as \si\. Corpus data places it at rank #46 in overall French word frequency, putting it firmly in the everyday core of the language. Wiktionary records 7 distinct senses for this headword, so context determines which meaning a reader should apply.

We couldn't generate a plausible misspelling set for si, a straightforward case of a spelling with little room for common typos. It also participates in 20 confusable-pair relationships, "st", "su", "so", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

No documented word history exists for this headword, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct French form is si, spelled S-I.

Definition

  1. 1
    Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.
  2. 2
    Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.
  3. 3
    Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.
  4. 4
    S’emploie encore elliptiquement pour exprimer un souhait, un regret.
  5. 5
    Dans diverses phrases où il s’agit, non d’une condition, d’une pure supposition, mais d’une chose certaine, il marque un rapport ou une opposition entre la proposition subordonnée et la proposition principale.
  6. 6
    Si oui ou non. Note d’usage : Conjonction utilisée pour former une question indirecte après certains verbes comme demander, dire, savoir, ignorer, etc., marquant le doute, l’interrogation.
  7. 7
    Si oui ou non. Note d’usage : Conjonction utilisée pour former une question indirecte après certains verbes comme demander, dire, savoir, ignorer, etc., marquant le doute, l’interrogation.

This word in other languages

if(English)si(Español)wenn(Deutsch)se(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 French corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "si"?
"si" is spelled S-I. The IPA pronunciation is \si\.
What does "si" mean?
As a conjunction, "si" means: Dans le cas où, à condition que, supposé que. Note d’usage : Conjonction qui introduit une condition (suivie d’une conséquence) ou une supposition qui peut être supprimée en utilisant un conditionnel.
What words are commonly confused with "si"?
"si" is commonly confused with "st", "su", "so". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "si"?
The IPA (International Phonetic Alphabet) transcription for "si" is \si\. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "si" come from?
"si" is a French word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
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 “si”

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

  • The one correct French spelling is S-I - every other letter order is a misspelling in standard orthography.
  • Say it as \si\ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “st” - see the side-by-side comparison. si vs st
  • Browse more French words and confusable pairs in the same reference. French 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