Etymograph

English

theism

Theism comes from Ancient Greek θεός ‘god’, and goes back to Proto-Indo-European *dʰeh₁- ‘to do’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁-1‘to do’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰéh₁s1‘god, godhead, deity’reconstructed
  3. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁sós1reconstructed
  4. Proto-Hellenicc. 2200–1600 BCE*tʰehós1‘god, deity’reconstructed
  5. Ancient Greekc. 800–300 BCEθεός1theós‘god’
  6. Englishearliest quotation 1999theism1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English theism
  2. Earliest quotation in Wiktionary’s entry: 1999, Jeaneane D. Fowler, Humanism: Beliefs & Practices: “The term stands in contradistinction to theism which, in…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁-Wiktionary, English theism‘to do’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰéh₁sWiktionary, English theism‘god, godhead, deity’reconstructed
  3. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁sósWiktionary, English theismreconstructed
  4. Proto-Hellenicc. 2200–1600 BCE*tʰehósWiktionary, English theism‘god, deity’reconstructed
  5. Ancient Greekc. 800–300 BCEθεόςWiktionary, English theismtheós‘god’
  6. Englishearliest quotation 1999theismWiktionary, English theism. Earliest quotation in Wiktionary’s entry: 1999, Jeaneane D. Fowler, Humanism: Beliefs & Practices: “The term stands in contradistinction to theism which, in…”

Formed from theo- + -ism

Proto-Indo-European *dʰeh₁- ‘to do’

…

Proto-Indo-European *dʰh₁sós

Proto-Hellenic *tʰehós ‘god, deity’

Ancient Greek θεός ‘god’

Latin theos ‘god’

English theo-

The story

Coined, theo- + -ism. ultimately from Ancient Greek θεός (theós, “god”). Attested in English from 1678, theist being attested 16 years earlier in 1662.

Full etymology on Wiktionary

Linked words

through Proto-Indo-European *dʰeh₁- ‘to do’

do, fact, deal, hot, defense, fan, benefit, fashion, feature, mid, defence, custom, sufficient, treasury, treasure, ethnic, theme, defendant, ethical, doom, tick, deed, aesthetic, synthetic, auditorium, auditor, demi, deem, spade, thesis, ethic, familial, medial, forfeit, medallion, prefect, certify, ethos, duma, thematic, 116 more

through Proto-Indo-European *dʰéh₁s ‘god, godhead, deity’

fair, feast, dis, feral, fanatic, profanity, profane, fane, fayre, 26 more

through Ancient Greek θεός ‘god’

theology, atheist, apotheosis, 19 more

Another origin of theism

  1. ms-oldmodernteh
  2. Hokkienmodern茶tê
  3. New Latinc. 1500–1900thea‘tea’
  4. Englishtodaytheism

Today it means

noun Belief in the existence of at least one deity.

Sources

Sources: Wiktionary, “theism”. 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 *dʰeh₁- / theism

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