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See also: plānus


Etymology 1[edit]

From Proto-Italic *plānos, from Proto-Indo-European *pleh₂-no-s (flattened), from *pleh₂- (flat).[1] Further related to Latin palma, planta, plautus, palam, palātum, and likely pellō.



plānus (feminine plāna, neuter plānum, comparative planior, superlative planissimus, adverb plānē); first/second-declension adjective

  1. level, flat, even
    Synonym: aequus
    Antonyms: impār, inīquus
  2. intelligible, clear

First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative plānus plāna plānum plānī plānae plāna
Genitive plānī plānae plānī plānōrum plānārum plānōrum
Dative plānō plānō plānīs
Accusative plānum plānam plānum plānōs plānās plāna
Ablative plānō plānā plānō plānīs
Vocative plāne plāna plānum plānī plānae plāna
Derived terms[edit]
  • Ibero-Romance:
    • Asturian: llanu
    • Mirandese: chano
    • Old Galician-Portuguese: chão (see there for further descendants)
    • Spanish: llano (see there for further descendants)
  • Insular Romance:
  • Italo-Romance:
    • Italian: piano (see there for further descendants)
    • Sicilian: chianu
  • Rhaeto-Romance:
  • Northern Gallo-Romance:
  • Southern Gallo-Romance:
  • Borrowings:

Etymology 2[edit]

From Ancient Greek πλάνος (plános), itself from πλᾰνάω (planáō, to wander).



planus m (genitive planī); second declension

  1. a tramp, hobo, vagabond, bum
  2. a cheat, impostor

Second-declension noun.

Case Singular Plural
Nominative planus planī
Genitive planī planōrum
Dative planō planīs
Accusative planum planōs
Ablative planō planīs
Vocative plane planī


  • planus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • planus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • planus 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)
  • planus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • level country; plains: loca plana or simply plana
  1. ^ De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 470