Etymograph

English

pro

Pro (advantage) comes from late Middle English pro, from Latin prō ‘on behalf of’, from Proto-Italic *prō.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*pró1‘toward’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*próh₁2reconstructed
  3. Proto-Italicc. 1500–700 BCE*prō1reconstructed
  4. Latinc. 75 BCE–200 CEprō2‘on behalf of’
  5. Middle Englishc. 1150–1500pro2‘advantage’
  6. Englishtodaypro2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin pro
  2. 2 Wiktionary, English pro

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*próWiktionary, Latin pro‘toward’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*próh₁Wiktionary, English proreconstructed
  3. Proto-Italicc. 1500–700 BCE*prōWiktionary, Latin proreconstructed
  4. Latinc. 75 BCE–200 CEprōWiktionary, English pro‘on behalf of’
  5. Middle Englishc. 1150–1500proWiktionary, English pro‘advantage’
  6. EnglishtodayproWiktionary, English pro

Word family

English words that share an ancestor with pro, grouped by the ancestor they share, most familiar first.

through Proto-Indo-European *pró ‘toward’

through Latin prō ‘on behalf of’

14 more relatives in the full family tree

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Today it means

noun An advantage of something, especially when contrasted with its disadvantages (cons).

Sources

Sources: Wiktionary, “pro”; the older steps come from the Wiktionary entry for Latin pro. 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 *pró / pro