Etymograph

English

coeffective

Coeffective comes from French effectif ‘number of members of a group’, from Latin effectīvus ‘creative’, and ultimately from Proto-Indo-European *dʰeh₁k-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁k-1reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁kyéti1reconstructed
  3. Proto-Italicc. 1500–700 BCE*θakjō1reconstructed
  4. Proto-Italicc. 1500–700 BCE*fakjō1‘to make’reconstructed
  5. Latinc. 75 BCE–200 CEfaciō1‘to make, construct, fashion, frame, build, erect’
  6. Latinc. 75 BCE–200 CEefficiō1‘to make out or work out’
  7. Latinc. 75 BCE–200 CEeffectīvus1‘creative’
  8. Frenchc. 1600–presenteffectif1‘number of members of a group’
  9. English1500–presenteffective1
  10. Englishearliest quotation 2015coeffective1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English coeffective
  2. Earliest quotation in Wiktionary’s entry: 2015, Cristian Ida, Coeffective basic cohomologies of K--contact and Sasakian ma: “Also, in this case, we prove some Hodge decomposition…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁k-Wiktionary, English coeffectivereconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁kyétiWiktionary, English coeffectivereconstructed
  3. Proto-Italicc. 1500–700 BCE*θakjōWiktionary, English coeffectivereconstructed
  4. Proto-Italicc. 1500–700 BCE*fakjōWiktionary, English coeffective‘to make’reconstructed
  5. Latinc. 75 BCE–200 CEfaciōWiktionary, English coeffective‘to make, construct, fashion, frame, build, erect’
  6. Latinc. 75 BCE–200 CEefficiōWiktionary, English coeffective‘to make out or work out’
  7. Latinc. 75 BCE–200 CEeffectīvusWiktionary, English coeffective‘creative’
  8. Frenchc. 1600–presenteffectifWiktionary, English coeffective‘number of members of a group’
  9. English1500–presenteffectiveWiktionary, English coeffective
  10. Englishearliest quotation 2015coeffectiveWiktionary, English coeffective. Earliest quotation in Wiktionary’s entry: 2015, Cristian Ida, Coeffective basic cohomologies of K--contact and Sasakian ma: “Also, in this case, we prove some Hodge decomposition…”

A compound of co- + effective

Proto-Indo-European *ḱóm ‘beside, near, by, with’

Proto-Italic *kom ‘with, along, at’

Proto-Italic *kom- ‘together’

English co-

Latin efficiō ‘to make; bring about’

Latin effectīvus ‘productive; effective’

French effectif ‘effective’

English effective

Linked words

through Proto-Italic *θakjō

affectionate, imperfection, putrefaction, 62 more

through Proto-Italic *fakjō ‘to make’

factor, difficulty, interface, manufacture, faction, perfection, affection, facet, imperfect, defection, deface, affective, defector, affectation, confectionary, 65 more

through Latin faciō ‘to make, construct, fashion, frame, build, erect’

face, fact, difficult, perfect, profit, feature, facility, faculty, sacrifice, affair, facial, facilitate, affect, deficit, feat, infection, superficial, facade, fetish, deficient, counterfeit, defect, facsimile, infect, hacienda, maleficent, aficionado, parfait, facies, beautify, difficile, confit, beneficent, effector, confection, refectory, 80 more

through Latin efficiō ‘to make out or work out’

effect, efficient, efficacy, efficacious, 14 more

through English effective

effectively, effectiveness, ineffective, 10 more

Today it means

adj effective within a cohomology

Sources

Sources: Wiktionary, “coeffective”. 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 *dʰeh₁k- / coeffective

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