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See also: Uncia and uncía



1685–95, from Latin uncia. Compare Latin ūnus (one). Doublet of ounce, inch, oka, and ouguiya.



English Wikipedia has an article on:

uncia (plural unciae)

  1. (classical studies) A twelfth part, an ounce, or an inch.
  2. (pharmacy) An ounce.
  3. A bronze coin minted during the Roman Republic, valued at one-twelfth of an as.
  4. (algebra, obsolete) A numerical coefficient in a case of the binomial theorem.


Latin numbers (edit)
 ←  11 XII
13  → [a], [b]
    Cardinal: duodecim
    Ordinal: duodecimus
    Adverbial: duodeciēs
    Multiplier: duodecuplus, duodecuplex, duodecimplus, duodecimplex, duodecemplus, duodecemplex
    Distributive: duodēnī
    Fractional: ū̆ncia


From ūnus.

This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.


The length of the vowel in the first syllable is uncertain. Although the vowel is etymologically long, there is evidence that originally long vowels could be shortened before consonant clusters starting in resonant consonants such as [ŋ] in Latin (a similar sound change by the name of Osthoff's Law occurred in Greek).[1] French once represents a Latin form ŭncia with a short vowel.[2]


ū̆ncia f (genitive ū̆nciae); first declension

  1. The twelfth part of something; twelfth.
  2. The twelfth part of a pound, ounce.
  3. The twelfth part of a foot, inch.
  4. The twelfth part of a jugerum.
  5. (figuratively) A trifle, bit, atom.


First-declension noun.

Case Singular Plural
Nominative ū̆ncia ū̆nciae
Genitive ū̆nciae ū̆nciārum
Dative ū̆nciae ū̆nciīs
Accusative ū̆nciam ū̆nciās
Ablative ū̆nciā ū̆nciīs
Vocative ū̆ncia ū̆nciae

Derived terms[edit]



  • uncia in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • uncia in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • uncia in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
  • uncia in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • uncia in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
  • Ačaṙean, Hračʿeay (1977), “ունկի”, in Hayerēn armatakan baṙaran [Dictionary of Armenian Root Words] (in Armenian), volume III, 2nd edition, reprint of the original 1926–1935 seven-volume edition, Yerevan: University Press, page 603a
  1. ^ Sayeed, Ollie (01 Jan 2017) "Osthoff’s Law in Latin", in Indo-European Linguistics, Volume 5, Issue 1, page 156
  2. ^ Sihler, Andrew L. (1995) New Comparative Grammar of Greek and Latin, page 78