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See also: -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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.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, G. & C. Merriam, 1913.)




Borrowed from Latin iter (route).


iter m (invariable)

  1. procedure, course
    Synonyms: procedura, corso




Conflation of an r/n-stem (where both stems are conflated, thus gen. itineris from inherited *itinis and analogical *iteris; compare iecur and fēmur), 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). Traditionally considered cognate also with Hittite 𒄿𒋻 (itar), a hapax legomenon widely believed to mean “road, path”, but in recent years the existence of this word has come into question, and it has been reinterpreted as a misreading and a ghost word.[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


  1. ^ Weeden, Mark (2011) , “Spelling, phonology and etymology in Hittite historical linguistics”, in Bulletin of the School of Oriental and African Studies[1], volume 74, issue 1, Cambridge University Press, DOI:10.1017/S0041977X10000716, page 72
  • 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[2], 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)‎[3], Leiden, Boston: Brill, →ISBN




  1. third-person singular present simple indicative positive degree of itmek

See also[edit]