Etymograph

English

regio

Regio comes from Latin regiō ‘direction, line’, from Proto-Indo-European *h₃réǵeti ‘to be straightening, to be setting upright’, and ultimately from *h₃reǵ-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*h₃reǵ-1‘to straighten’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*h₃réǵeti1‘to be straightening, to be setting upright’reconstructed
  3. Proto-Italicc. 1500–700 BCE*regō1reconstructed
  4. Latinc. 75 BCE–200 CEregō1‘to rule, govern, direct’
  5. Latinc. 75 BCE–200 CEregiō2‘direction, line’
  6. Englishearliest quotation 1907regio2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin regio
  2. 2 Wiktionary, English regio
  3. Earliest quotation in Wiktionary’s entry: 1907, Ronald M. Burrows, The Discoveries In Crete: “The British School has unearthed a city of continuous…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*h₃reǵ-Wiktionary, Latin regio‘to straighten’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*h₃réǵetiWiktionary, Latin regio‘to be straightening, to be setting upright’reconstructed
  3. Proto-Italicc. 1500–700 BCE*regōWiktionary, Latin regioreconstructed
  4. Latinc. 75 BCE–200 CEregōWiktionary, Latin regio‘to rule, govern, direct’
  5. Latinc. 75 BCE–200 CEregiōWiktionary, English regio‘direction, line’
  6. Englishearliest quotation 1907regioWiktionary, English regio. Earliest quotation in Wiktionary’s entry: 1907, Ronald M. Burrows, The Discoveries In Crete: “The British School has unearthed a city of continuous…”

Linked words

through Proto-Indo-European *h₃reǵ- ‘to straighten’

right, real, rich, royal, correct, regular, rank, arrangement, roy, radar, arrange, rack, rogue, raj, rex, interrogation, rake, dresser, rector, rani, regency, regal, rajah, undress, dressage, rhesus, eldritch, riel, derailleur, rectilinear, dirigible, interregnum, retch, 75 more

through Proto-Indo-European *h₃réǵeti ‘to be straightening, to be setting upright’

ana, anorexia, 42 more

through Proto-Italic *regō

direction, resource, ruler, directory, regiment, erectile, regimen, erectus, erector, 37 more

through Latin regō ‘to rule, govern, direct’

source, rule, director, address, direct, dress, realm, regime, regulate, resurrection, erect, rectify, regent, insurrection, rectum, droit, dirge, incorrigible, irregularity, rectification, rectitude, recto, rectus, derecho, regula, corregidor, 49 more

Today it means

noun Any large area of a planet or moon that is strongly differentiated from neighbouring areas by colour or albedo.

Sources

Sources: Wiktionary, “regio”; the older steps come from the Wiktionary entry for Latin regio. 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 *h₃reǵ- / regio

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