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Latin numbers (edit)
[a], [b] ←  2 III
4  → 
    Cardinal: trēs
    Ordinal: tertius
    Adverbial: ter
    Multiplier: triplex, triplus
    Distributive: ternus, trīnus
    Collective: terniō
    Fractional: triēns


From Proto-Indo-European *tr̥tyós ~ *tritós, ordinal form of *tréyes. Akin to Ancient Greek τρίτος (trítos), Proto-Germanic *þridjô and Proto-Slavic *tretь.



tertius (feminine tertia, neuter tertium); first/second-declension numeral

  1. third, the ordinal number after secundus (second) and before quārtus (fourth)

Usage notes[edit]

  • In a poetic sense it is used for the Roman "Third World", that is the "Underworld", of Pluto


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative tertius tertia tertium tertiī tertiae tertia
Genitive tertiī tertiae tertiī tertiōrum tertiārum tertiōrum
Dative tertiō tertiō tertiīs
Accusative tertium tertiam tertium tertiōs tertiās tertia
Ablative tertiō tertiā tertiō tertiīs
Vocative tertie tertia tertium tertiī tertiae tertia

Derived terms[edit]



  • tertius”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • tertius”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • tertius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • tertius in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • it is the third hour (= 9 A.M.: tertia hora est
    • I am in my thirteenth year: tertium decimum annum ago
    • to be middle-aged (i.e. between thirty and forty): tertiam iam aetatem videre
    • to admit another into the circle of one's intimates: aliquem (tertium) ad (in) amicitiam ascribere
    • the actor who plays the leading part: actor primarum (secundarum, tertiarum) partium
    • consul for the second, third time: iterum, tertium consul