Etymograph

English

equieffective

Equieffective 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 2015equieffective1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English equieffective
  2. Earliest quotation in Wiktionary’s entry: 2015: “Construction of regression curves and calculating of the equieffective…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁k-Wiktionary, English equieffectivereconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁kyétiWiktionary, English equieffectivereconstructed
  3. Proto-Italicc. 1500–700 BCE*θakjōWiktionary, English equieffectivereconstructed
  4. Proto-Italicc. 1500–700 BCE*fakjōWiktionary, English equieffective‘to make’reconstructed
  5. Latinc. 75 BCE–200 CEfaciōWiktionary, English equieffective‘to make, construct, fashion, frame, build, erect’
  6. Latinc. 75 BCE–200 CEefficiōWiktionary, English equieffective‘to make out or work out’
  7. Latinc. 75 BCE–200 CEeffectīvusWiktionary, English equieffective‘creative’
  8. Frenchc. 1600–presenteffectifWiktionary, English equieffective‘number of members of a group’
  9. English1500–presenteffectiveWiktionary, English equieffective
  10. Englishearliest quotation 2015equieffectiveWiktionary, English equieffective. Earliest quotation in Wiktionary’s entry: 2015: “Construction of regression curves and calculating of the equieffective…”

A compound of equi- + effective

Old Latin aiquos

Latin aequus ‘equal’

English equi-

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, perfection, faction, affection, facet, imperfect, defection, deface, affective, defector, confectionary, affectation, 65 more

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

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

Sources

Sources: Wiktionary, “equieffective”. 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- / equieffective

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