si.
if, supposing that
Meaning & usage
if, supposing that
Sī versūs hōrum duōrum poētārum neglegētis, magnā parte litterārum carēbitis.
Sī vis pacem, para bellum.
whether (when a verb of seeing or trying is the main verb in the apodosis; or when sī is used twice correlatively)
sī... sī
Where this word comes from
From Proto-Italic *sei (“so, thus”) used in parataxis, likely via the meaning "in this" as the locative singular of Proto-Indo-European *só (“this, that”); this older meaning is preserved in Latin sīc as well as in the oath sī dīs placet, cf. English so help me God. Related to Old English sē (“he, that”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.