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See also: Axis and áxis


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Etymology 1[edit]

Borrowed from Latin axis (axle, axis) in the 16th century. Doublet of axle.


axis (plural axes or (rare) axiis)

  1. (geometry) An imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry).
    • 2012 March 1, Henry Petroski, “Opening Doors”, in American Scientist[1], volume 100, number 2, page 112-3:
      A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place.
    The Earth rotates once a day on its axis
  2. (mathematics) A fixed one-dimensional figure, such as a line or arc, with an origin and orientation and such that its points are in one-to-one correspondence with a set of numbers; an axis forms part of the basis of a space or is used to position and locate data in a graph (a coordinate axis)
  3. (anatomy) The second cervical vertebra of the spine
    Synonym: epistropheus
  4. (anatomy) An imaginary, visualized plane separating two morphologically similar parts of an organism
  5. (psychiatry) A form of classification and descriptions of mental disorders or disabilities used in manuals such as the DSM (Diagnostic and Statistical Manual of Mental Disorders)
  6. (botany) The main stem or central part about which organs or plant parts such as branches are arranged
  7. (military) An alliance or coalition.
    Synonyms: pact, compact, league
    • 1936, November 1st, Benito Mussolini, Milan Speech:
      This Berlin-Rome vertical line is not an obstacle but rather an axis around which can revolve all those European states with a will to collaboration and peace.
Coordinate terms[edit]
  • (cervical vertebra): atlas
Derived terms[edit]
Related terms[edit]

Etymology 2[edit]

From Latin, name of an Indian animal mentioned by the Roman senator Pliny.


axis (plural axises)

  1. A deer native to Asia, of species Axis axis.
    Synonyms: chital, cheetal, chital deer, spotted deer, axis deer
See also[edit]



From Proto-Italic *aksis, from Proto-Indo-European *h₂eḱs-i-s, from *h₂eḱs- (axis, axle); see also Lithuanian ašis (axle), Russian ось (osʹ), Sanskrit अक्ष (ákṣa, axis, axle, balance beam), Ancient Greek ἄξων (áxōn, axle), Old High German ahsa (axle), Icelandic eax, öxull, öksull, Old English eaxl (whence English axle). Compare also Etruscan 𐌀𐌂𐌔𐌉 (Acsi, the Axia gens).



axis m (genitive axis); third declension

  1. An axletree of wagon, car, chariot.
  2. The North Pole.
  3. The heavens or a region or clime of these.
  4. A board, plank.


Third-declension noun (i-stem).

Case Singular Plural
Nominative axis axēs
Genitive axis axium
Dative axī axibus
Accusative axem axēs
Ablative axe axibus
Vocative axis axēs

Derived terms[edit]


  • Italo-Romance:
    • Italian: asse
  • Padanian:
    • Friulian: as
    • Lombard: ax
    • Piedmontese: ass
    • Venetian: ase
  • Northern Gallo-Romance:
  • Southern Gallo-Romance:
  • Ibero-Romance:
  • Borrowings:


  • axis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • axis”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • axis 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)
  • axis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • Carl Meißner; Henry William Auden (1894) Latin Phrase-Book[2], London: Macmillan and Co.
    • the pole: vertex caeli, axis caeli, cardo caeli
  • axis”, in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • axis”, in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
  • Langenscheidt Pocket Latin Dictionary



axis m (plural axis)

  1. (anatomy) axis (vertebra)

Further reading[edit]