of, pertaining to, characterized by, or forming an axis: an axial relationship.
situated in or on an axis.

1840–50; axi- + -al1

axiality, noun
axially, adverb
interaxial, adjective
multiaxial, adjective
multiaxially, adverb
subaxial, adjective
subaxially, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
axial (ˈæksɪəl)
1.  relating to, forming, or characteristic of an axis
2.  situated in, on, or along an axis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to an axis," 1842 (in axially), from axis + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

axial ax·i·al (āk'sē-əl)

  1. Relating to or characterized by an axis; axile.

  2. Relating to or situated in the head and trunk region of the body.

  3. Relating to or parallel with the long axis of a tooth.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
axis   (āk'sĭs)  Pronunciation Key 
Plural axes (āk'sēz')
  1. An imaginary line around which an object rotates. In a rotating sphere, such as the Earth and other planets, the two ends of the axis are called poles. The 23.45° tilt of the Earth's axis with respect to the plane of its orbit around the Sun causes the Northern and Southern Hemispheres to point toward and away from the Sun at different times of the year, creating seasonal patterns of weather and climate. Other planets in the solar system have widely varying tilts to their axes, ranging from near 0° for Mercury to 177° for Venus.

  2. Mathematics

    1. A line, ray, or line segment with respect to which a figure or object is symmetrical.

    2. A reference line from which distances or angles are measured in a coordinate system, such as the x-axis and y-axis in the Cartesian coordinate system.

  3. Anatomy The second cervical vertebra, which serves as a pivot for the head.

  4. Botany The main stem or central part of a plant or plant part, about which other plant parts, such as branches or leaflets, are arranged.

axial adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
From this centriole an axial filament, surrounded by a sheath, runs backward
  through the body and tail.
The developmental anomaly that causes animals to occasionally form two heads is
  called axial bifurcation.
In addition they are motile and and apparently exhibit axial symmetry.
When the axial tilt is higher, the monsoon bands move farther away from the
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