secretum

From Latin sēcrētum.^[1] Doublet of secret.

secretum (plural secreta)

1. A special seal used for private correspondence.
   • 1774, Proceedings of the Suffolk Institute of Archaeology and Natural History, page 334:

     A personal Seal having a secretum is unusual; with armorial and monastic seals they are very common; […]

• (Classical Latin) IPA^(key): [seːˈkreː.tũː]
• (modern Italianate Ecclesiastical) IPA^(key): [seˈkrɛː.t̪um]

sēcrētum

1. inflection of sēcrētus:
   1. nominative/accusative/vocative neuter singular
   2. accusative masculine singular

sēcrētum n (genitive sēcrētī); second declension

1. withdrawal, loneliness, secluded place
2. secret, private matter or conversation

   in secreto, in secretum, a secreto ― secretly, discreetly, in a private manner, without witness

3. (in the plural) private life
4. (in the plural) secret documents
5. (in the plural) mystery, secret cult
6. to be mysterious, mysterious presence

Second-declension noun (neuter).

• “secretum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• "secretum", 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)
• secretum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • (ambiguous) in private; tête-à-tête: remotis arbitris or secreto
    
• Dizionario Latino, Olivetti