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From nōtus (known, recognized, acquainted with), perfect passive participle of nōscō.


nōtiō f (genitive nōtiōnis); third declension

  1. acquaintance (becoming acquainted)
  2. examination, investigation
  3. notion, idea


Third declension.

Case Singular Plural
Nominative nōtiō nōtiōnēs
Genitive nōtiōnis nōtiōnum
Dative nōtiōnī nōtiōnibus
Accusative nōtiōnem nōtiōnēs
Ablative nōtiōne nōtiōnibus
Vocative nōtiō nōtiōnēs



  • notio in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • notio in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • notio in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • notio in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • innate ideas: notiones animo (menti) insitae, innatae
    • to form a conception, notion of a thing: notionem or rationem alicuius rei in animo informare or animo concipere
    • what is the meaning, the original sense of this word: quae notio or sententia subiecta est huic voci?
    • the fundamental meaning of a word: vis et notio verbi, vocabuli
    • Nature has implanted in all men the idea of a God: natura in omnium animis notionem dei impressit (N. D. 1. 16. 43)