Etymograph

English

calendarium

Calendarium comes from Latin calendārium ‘an account book or debt book’, from calō ‘to call out’, and ultimately from Proto-Indo-European *kelh₁-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kelh₁-1‘to call, shout’reconstructed
  2. Proto-Italicc. 1500–700 BCE*kalō1‘to call’reconstructed
  3. Latinc. 75 BCE–200 CEcalō2‘to call out’next step skipped: Latin calendārius
  4. Latinc. 75 BCE–200 CEcalendārium3‘an account book or debt book’
  5. Englishearliest quotation 1865calendarium3

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin calo
  2. 2 Wiktionary, Latin calendarium
  3. 3 Wiktionary, English calendarium
  4. Earliest quotation in Wiktionary’s entry: 1865, PHŒNI’CIA: “Phœnician names occur in Suidas, Dioscorides, Apuleius, in martyrologies,…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*kelh₁-Wiktionary, Latin calo‘to call, shout’reconstructed
  2. Proto-Italicc. 1500–700 BCE*kalōWiktionary, Latin calo‘to call’reconstructed
  3. Latinc. 75 BCE–200 CEcalōWiktionary, Latin calendarium‘to call out’next step skipped: Latin calendārius
  4. Latinc. 75 BCE–200 CEcalendāriumWiktionary, English calendarium‘an account book or debt book’
  5. Englishearliest quotation 1865calendariumWiktionary, English calendarium. Earliest quotation in Wiktionary’s entry: 1865, PHŒNI’CIA: “Phœnician names occur in Suidas, Dioscorides, Apuleius, in martyrologies,…”

Linked words

through Proto-Indo-European *kelh₁- ‘to call, shout’

low, hell, claim, clear, classic, claire, declare, haul, reconciliation, clarity, proclamation, classify, clarification, reclamation, exclamation, clarinet, squeal, clamor, clarion, clamour, claret, clas, ecclesiastic, ecclesial, 36 more

through Latin calō ‘to call out’

counsel, reconcile, irreconcilable, conciliar, 9 more

Today it means

noun A calendar or timeline or events.

Sources

Sources: Wiktionary, “calendarium”; the older steps come from the Wiktionary entries for Latin calo, Latin calendarium. 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 *kelh₁- / calendarium

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