tri (Esperanto)

Where does "tri" come from?

The Esperanto word 'tri' is a direct reflection of the ancient Proto-Indo-European root '*tréyes', meaning three. This numerical concept has been remarkably stable, appearing across countless languages such as Latin, Old English, and Russian as they evolved along their distinct paths. By adopting 'tri', Esperanto draws upon this vast ancestral heritage to provide a simple, universally recognizable word for the number three.

Full etymology tree

• tri (Esperanto), 'three (3)'
  • borrowed три (tri) (Russian), 'three (3)'
    • inherited *tréyes (Proto-Indo-European), 'three'
  • borrowed trēs (Latin), 'three; 3'
    • inherited *tréyes (Proto-Indo-European), 'three'
  • borrowed three (English), 'A numerical value after two and before four. Represented in Arabic digits as 3; this many dots (•••).'
    • inherited *tréyes (Proto-Indo-European), 'three'

Ancestors

• три (Russian)
• tres (Latin)
• three (English)
• *tréyes (Proto-Indo-European)

Descendants and derived words

• trio (Esperanto)
• tripunkto (Esperanto)

Updated July 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris