Etymograph

English

equability

Equability comes from Latin aequabilitas ‘equality, uniformity, equability’, from aequō ‘to make even, level’, and ultimately from Old Latin aiquos.

  1. Old Latinc. 700–75 BCEaiquos1
  2. Latinc. 75 BCE–200 CEaequus1‘level, equal’
  3. Latinc. 75 BCE–200 CEaequō2‘to make even, level’
  4. Latinc. 75 BCE–200 CEaequabilis3‘equal, similar, like’
  5. Latinc. 75 BCE–200 CEaequabilitas3‘equality, uniformity, equability’
  6. Englishearliest quotation 1902equability3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin aequo
  2. 2 Wiktionary, Latin aequabilis
  3. 3 Wiktionary, English equability
  4. Earliest quotation in Wiktionary’s entry: 1902, Barbara Baynton, Bush Studies (Portable Australian Authors: Barbara Baynton): “She was taller than the man, and the equability…”.

Earlier history uncertain. See Wiktionary.

Lineage

  1. Old Latinc. 700–75 BCEaiquosWiktionary, Latin aequo
  2. Latinc. 75 BCE–200 CEaequusWiktionary, Latin aequo‘level, equal’
  3. Latinc. 75 BCE–200 CEaequōWiktionary, Latin aequabilis‘to make even, level’
  4. Latinc. 75 BCE–200 CEaequabilisWiktionary, English equability‘equal, similar, like’
  5. Latinc. 75 BCE–200 CEaequabilitasWiktionary, English equability‘equality, uniformity, equability’
  6. Englishearliest quotation 1902equabilityWiktionary, English equability. Earliest quotation in Wiktionary’s entry: 1902, Barbara Baynton, Bush Studies (Portable Australian Authors: Barbara Baynton): “She was taller than the man, and the equability…”

Linked words

through Proto-Italic *aikʷos

inequality, 10 more

through Old Latin aiquos

equality, inequitable, 11 more

through Latin aequus ‘level, equal’

equal, equity, egalitarian, equitable, 13 more

through Latin aequō ‘to make even, level’

equation, equate, 2 more

Today it means

noun The condition of being equable.

Sources

Sources: Wiktionary, “equability”; the older steps come from the Wiktionary entries for Latin aequo, Latin aequabilis. 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 / Old Latin aiquos / equability

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