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See also: -iter, ITER, and iter.



Borrowed from Latin iter (passage).


iter (plural iters)

  1. (anatomy) A passage, especially the passage between the third and fourth ventricles in the brain; the cerebral aqueduct.
    • 1916, Mayo Clinic, Collected Papers of the Mayo Clinic and the Mayo Foundation, page 869:
      This fluid passes through the main iters which connect the various ventricles and filters through the thin membranes of the brain and cord, equalizing the pressure at all points.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “iter”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)




Borrowed from Latin iter (route).


  • IPA(key): /ˈi.ter/
  • Rhymes: -iter
  • Hyphenation: ì‧ter


iter m (invariable)

  1. procedure, course
    Synonyms: procedura, corso



Latin Wikipedia has an article on:
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Alternative forms[edit]

  • itur (considered a misspelling)


From Proto-Italic *eitər, *eitor, conflation of an r/n-stem (where both stems are conflated, thus gen. itineris from inherited *itinis and analogical *iteris; compare iecur and femur), from Proto-Indo-European reconstructed as *h₁éy-tr̥ ~ *h₁i-tén-, from *h₁ey- (whence ).

Cognate with Tocharian A ytārye (path, road), Avestan 𐬌𐬚𐬥𐬀(iθna) in 𐬞𐬀𐬌𐬭𐬌-𐬌𐬚𐬥𐬀-(pairi-iθna-, (end of) lifetime).[1]



iter n (genitive itineris); third declension

  1. a route, whether:
    1. a journey, trip
    2. a march
    3. a course
    4. a path; a road
      Synonym: via
    5. (Medieval Latin, law) a court circuit
  2. (Medieval Latin, medicine) a passage

Usage notes[edit]

Used in the phrase in itinere to mean abroad.


Third-declension noun (neuter, imparisyllabic non-i-stem).

Case Singular Plural
Nominative iter itinera
Genitive itineris itinerum
Dative itinerī itineribus
Accusative iter itinera
Ablative itinere itineribus
Vocative iter itinera

Derived terms[edit]


  • Old French: erre, eirre, oirre
  • English: itinerary, iter
  • Italian: iter
  • Portuguese: itinerário


  1. ^ De Vaan, Michiel (2008), “iter, itineris”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 311
  • iter”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • iter in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to finish a very long journey: longum itineris spatium emetiri
    • to return from a journey: ex itinere redire
    • on a journey; by the way: in itinere
    • travelling day and night: itinera diurna nocturnaque
    • to spare oneself the trouble of the voyage: labore supersedēre (itineris) (Fam. 4. 2. 4)
    • by forced marches: magnis itineribus (Sall. Iug. 37)
    • by the longest possible forced marches: quam maximis itineribus (potest)
    • to change one's route and march towards..: averso itinere contendere in...
    • (ambiguous) to obstruct a road; to close a route: iter obstruere
    • (ambiguous) (1) to take a journey, (2) to make, lay down a road (rare): iter facere
    • (ambiguous) to travel together: una iter facere
    • (ambiguous) to begin a journey (on foot, on horseback, by land): iter ingredi (pedibus, equo, terra)
    • (ambiguous) to journey towards a place: iter aliquo dirigere, intendere
    • (ambiguous) travel by land, on foot: iter terrestre, pedestre
    • (ambiguous) a day's journey: iter unius diei or simply diei
    • (ambiguous) an impassable road: iter impeditum
    • (ambiguous) to march: iter facere
    • (ambiguous) to traverse a route: iter conficere (B. C. 1. 70)
    • (ambiguous) to quicken the pace of marching: iter maturare, accelerare
    • (ambiguous) to march without interruption: iter continuare (B. C. 3. 11)
    • (ambiguous) not to interrupt the march: iter non intermittere
    • (ambiguous) to deviate, change the direction: iter flectere, convertere, avertere
    • (ambiguous) to force a way, a passage: iter tentare per vim (cf. sect. II. 3)
    • (ambiguous) a breach: iter ruina patefactum
  • iter”, in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • iter”, in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
  • De Vaan, Michiel (2008) Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7)‎[2], Leiden, Boston: Brill, →ISBN




  1. third-person singular indicative aorist of itmek