Etymograph

English

proclivity

Proclivity comes from Latin prōclīvitās ‘tendency, proneness, disposition, propensity’, and goes back to Proto-Indo-European *ḱley-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*ḱley-1root named by Wiktionary
  2. Latinc. 75 BCE–200 CEprōclīvis1‘prone to’
  3. Latinc. 75 BCE–200 CEprōclīvitās1‘tendency, proneness, disposition, propensity’
  4. Englishearliest quotation 1922proclivity1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English proclivity
  2. Earliest quotation in Wiktionary’s entry: 1922, James Joyce, [16]: “This therefore was the reason why the still comparatively…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*ḱley-Wiktionary, English proclivityroot named by Wiktionary
  2. Latinc. 75 BCE–200 CEprōclīvisWiktionary, English proclivity‘prone to’
  3. Latinc. 75 BCE–200 CEprōclīvitāsWiktionary, English proclivity‘tendency, proneness, disposition, propensity’
  4. Englishearliest quotation 1922proclivityWiktionary, English proclivity. Earliest quotation in Wiktionary’s entry: 1922, James Joyce, [16]: “This therefore was the reason why the still comparatively…”

Linked words

through Proto-Indo-European *ḱley-

law, low, climate, lean, decline, ladder, lid, climax, inclination, eyelid, incline, clinician, cline, declension, declination, 26 more

Today it means

noun A predisposition or natural inclination, propensity, or a predilection; especially, a strong disposition or bent.

Sources

Sources: Wiktionary, “proclivity”. 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 *ḱley- / proclivity

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