Etymograph

English

tri-

Tri- comes from Proto-Italic *tri- ‘three, tri-’, and goes back to Proto-Indo-European *tri-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*tri-1‘three, threefold’reconstructed
  2. Proto-Italicc. 1500–700 BCE*tri-2‘three, tri-’reconstructed
  3. Englishtodaytri-3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Proto-Italic *tri-
  2. 2 Wiktionary, Latin tri-
  3. 3 Wiktionary, English tri-

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*tri-Wiktionary, Proto-Italic *tri-‘three, threefold’reconstructed
  2. Proto-Italicc. 1500–700 BCE*tri-Wiktionary, Latin tri-‘three, tri-’reconstructed
  3. Englishtodaytri-Wiktionary, English tri-

Linked words

through Proto-Indo-European *tri- ‘three, threefold’

tertiary, trine, 12 more

through Proto-Italic *tri- ‘three, tri-’

trial, triple, trillion, treble

Another origin of tri-

  1. Proto-Indo-Europeanc. 4500–2500 BCE*tréyes‘three’reconstructed
  2. Proto-Indo-Iranianc. 2500–1800 BCE*tráyas‘three’reconstructed
  3. Proto-Indo-Aryanprehistoric (reconstructed)*tráyasreconstructed
  4. Sanskritc. 1500–500 BCEत्रिtri‘three’
  5. Englishtodaytri-

Today it means

prefix Three.

Sources

Sources: Wiktionary, “tri-”; the older steps come from the Wiktionary entries for Proto-Italic *tri-, Latin tri-. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *tri- / tri-

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