# twi-

> English word · Prefix

## Definitions
1. two
2. double, both

## Etymology
From Middle English twi-, from Old English twi- (“two, double”), from Proto-Germanic *twi- (“two-, double-”), from Proto-Indo-European *dwi- (“two-, double-”) (compare Proto-Germanic *twiz- (“twice”), from Proto-Indo-European *dwís (“twice”)), from Proto-Indo-European *dwóh₁ (“two”).
Compare twin, twice, two, and see more details at two. Further related to the prefixes bi-, di-, and dis-.
Cognate with German zwie- (“twice”), Swedish tve- (“twi-, double”), Russian дву- (dvu-), двух- (dvux-) Old Prussian dwi- (“twi-”), Latin bi-, bis (“twice”) (< Old Latin dui-, duis).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/twi