Etymograph

English

why

Why comes from Old English hwȳ ‘why’, from Proto-Germanic *hwī ‘by what, how’ (an instrumental form of the interrogative pronoun), and ultimately from the Proto-Indo-European interrogative root *kʷ-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kʷ-1‘interrogative root’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*kʷís1‘who, what’reconstructed
  3. Proto-Germanicc. 500 BCE–200 CE*hwī1‘by what, how’reconstructed
  4. Proto-West Germanicc. 200–500 CE*hwiu2reconstructed
  5. Old Englishc. 450–1150hwȳ1‘why’
  6. Middle Englishc. 1150–1500why1
  7. Englishearliest quotation 1724why1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English why
  2. 2 Wiktionary, Old English hwy
  3. Earliest quotation in Wiktionary’s entry: 1724, Daniel Defoe, The Fortunate Mistress; […] [Roxana]: “VVhy Child, I tell thee if I vvas thy…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kʷ-Wiktionary, English why‘interrogative root’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*kʷísWiktionary, English why‘who, what’reconstructed
  3. Proto-Germanicc. 500 BCE–200 CE*hwīWiktionary, English why‘by what, how’reconstructed
  4. Proto-West Germanicc. 200–500 CE*hwiuWiktionary, Old English hwyreconstructed
  5. Old Englishc. 450–1150hwȳWiktionary, English why‘why’
  6. Middle Englishc. 1150–1500whyWiktionary, English why
  7. Englishearliest quotation 1724whyWiktionary, English why. Earliest quotation in Wiktionary’s entry: 1724, Daniel Defoe, The Fortunate Mistress; […] [Roxana]: “VVhy Child, I tell thee if I vvas thy…”

Linked words

through Proto-Indo-European *kʷ- ‘the primary interrogative root’

which, who, whether, whose, whom, neutral, quantity, ubiquitous, rapunzel, whence, ubiquity, whither, cadenza, 12 more

through Proto-Indo-European *kʷís ‘who’

how, what, when, where, ut, quid, quip, 5 more

Today it means

adv Introducing a complete question.

Sources

Sources: Wiktionary, “why”; the older steps come from the Wiktionary entry for Old English hwy. 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 *kʷ- / why

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