axis

noun
ax·​is | \ ˈak-səs How to pronounce axis (audio) \
plural axes\ -​ˌsēz How to pronounce axes (audio) \

Definition of axis

 (Entry 1 of 2)

1a : a straight line about which a body or a geometric figure rotates or may be supposed to rotate the Earth's axis
b : a straight line with respect to which a body or figure is symmetrical the axis of a cone

called also axis of symmetry

c : a straight line that bisects at right angles a system of parallel chords of a curve and divides the curve into two symmetrical parts
d : one of the reference lines of a coordinate system (see coordinate entry 3 sense 1a)

2 anatomy

a : the second vertebra of the neck on which the head and first vertebra turn as on a pivot
b : any of various central, fundamental, or axial parts
3 botany : a plant stem
4 crystallography : one of several imaginary lines assumed in describing the positions of the planes by which a crystal is bounded and the positions of atoms in the structure of the crystal
5 : a main line of direction, motion, growth, or extension the axis of a city
6a : an implied line in painting or sculpture through a composition to which elements in the composition are referred fruit and flowers arranged about a diagonal axis
b : a line actually drawn and used as the basis of measurements in an architectural or other working drawing
7 aviation : any of three fixed lines of reference in an aircraft that run in the longitudinal, lateral, and vertical directions, are mutually perpendicular, and usually pass through the aircraft's center of gravity
8 : partnership, alliance an axis of countries
9 : a point or continuum on which something centers an axis of social power

Axis

adjective

Definition of Axis (Entry 2 of 2)

: of or relating to the three powers Germany, Italy, and Japan engaged against the Allied nations in World War II

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Examples of axis in a Sentence

Noun

the Earth's axis of rotation the spin of the Earth on its axis

Recent Examples on the Web: Noun

On Capitol Hill, the party has been spread along a similar axis of race, power, perspective and privilege. Molly Ball, Time, "What Do the Democrats Stand For? Inside a Fight Over America's Future," 25 July 2019 Made up of nine coloured squares on each of its six faces, the cube rotates around a central axis. The Economist, "Speedcubers are solving Rubik’s Cubes at ever-faster speeds," 11 July 2019 Situated between the sea and a lake, the city expanded on a north-south axis. National Geographic, "These five maps reveal how transit and geography can shape a city," 27 June 2019 The seasons, and the changing length of daylight hours throughout the year, are all due to one fact: Earth spins on a tilted axis. Brian Resnick, Vox, "Earth’s seasons, explained in one GIF," 21 June 2019 At first, Danny and Karl can only move horizontally right and left on a two-dimensional axis, mimicking the visual approach of old-fashioned arcade cabinets. David Sims, The Atlantic, "Black Mirror: The Weird, Intriguing Intimacy of ‘Striking Vipers’," 5 June 2019 My client wanted to add a third axis, but my brain started to hurt. Kathryn Crawford Saxer, The Seattle Times, "How to make a big career decision," 25 Mar. 2019 That said, now and again something comes along and throws my entire listening process onto a new axis. Corey Seymour, Vogue, "The Caretaker’s Musical Project Is One Part Psychological Experiment, One Part Auditory Revelation," 14 Dec. 2018 Instead, the Houses reflect the earth’s own 24-hour rotation around its axis. Aliza Kelly Faragher, Allure, "The 12 Astrological Houses: Interpreting Your Birth Chart Beyond the Zodiac," 6 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'axis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of axis

Noun

14th century, in the meaning defined at sense 1a

Adjective

1938, in the meaning defined above

History and Etymology for axis

Noun

Latin, axis, axle; akin to Old English eax axis, axle, Greek axōn, Lithuanian ašis, Sanskrit akṣaḥ

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More Definitions for axis

axis

noun

English Language Learners Definition of axis

: the imaginary straight line that something (such as the Earth) turns around
: a straight line that divides a shape evenly into two parts

axis

noun
ax·​is | \ ˈak-səs How to pronounce axis (audio) \
plural axes\ ˈak-​ˌsēz \

Kids Definition of axis

1 : a straight line about which a body or a geometric figure rotates or may be thought of as rotating the earth's axis
2 : a line of reference used to assign numbers to locations in a geometric plane