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From Proto-Italic *aissāts, with the suffix -tāt-s restored via analogy. The root is from Proto-Indo-European *h₂eydʰ- (burn; fire), and has cognates in Latin aestus, perhaps aedis, Ancient Greek αἴθω (aíthō)), Old English ād (pyre). The noun suffix is from Proto-Indo-European *-teh₂ts.

De Vaan criticizes a prevalent simple etymology from *h₂e-h₂idʰ-teh₂t-s (with an i-reduplicated root) as unfounded, also observing -dʰt- becomes -ss- in Latin rather than -st-, preferring instead *h₂eydʰ-teh₂ts > Proto-Italic *aissāt-s, which then had the suffix -t- consonant restored.



aestās f (genitive aestātis); third declension

  1. summer


Third-declension noun.

Case Singular Plural
Nominative aestās aestātēs
Genitive aestātis aestātum
Dative aestātī aestātibus
Accusative aestātem aestātēs
Ablative aestāte aestātibus
Vocative aestās aestātēs

Derived terms[edit]

Related terms[edit]



  • De Vaan, Michiel (2008), “aestās”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 28
  • aestas”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • aestas”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • aestas in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • in the height of summer, depth of winter: summa aestate, hieme
  • Walther von Wartburg (1928–2002), “aestas”, in Französisches Etymologisches Wörterbuch (in German), volume 24: Refonte A–Aorte, page 229