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• axis
  axis

  noun

  the line about which a rotating body, such as the earth, turns.
• Axis
  Axis

axis

¹ American  

[ak-sis] / ˈæk sɪs /

noun

• axes
  plural

1. the line about which a rotating body, such as the earth, turns.

2. Mathematics.

   1. a central line that bisects a two-dimensional body or figure.

   2. a line about which a three-dimensional body or figure is symmetrical.

3. Anatomy.

   1. a central or principal structure, about which something turns or is arranged.

      the skeletal axis.

   2. the second cervical vertebra.

4. Botany. the longitudinal support on which organs or parts are arranged; the stem and root; the central line of any body.

5. Analytic Geometry. any line used as a fixed reference in conjunction with one or more other references for determining the position of a point or of a series of points forming a curve or a surface.

6. Crystallography. crystallographic axis.

7. Aeronautics. any one of three lines defining the attitude of an airplane, one being generally determined by the direction of forward motion and the other two at right angles to it and to each other.

8. Fine Arts. an imaginary line, in a given formal structure, about which a form, area, or plane is organized.

9. an alliance of two or more nations to coordinate their foreign and military policies, and to draw in with them a group of dependent or supporting powers.

10. the Axis, (in World War II) Germany, Italy, and Japan, often with Bulgaria, Hungary, and Romania.

11. a principal line of development, movement, direction, etc.

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axis ² American  

[ak-sis] / ˈæk sɪs /

noun

• axises
  plural

1. axis deer.

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axis ¹ British  

/ ˈæksɪs /

noun

1. a real or imaginary line about which a body, such as an aircraft, can rotate or about which an object, form, composition, or geometrical construction is symmetrical

2. one of two or three reference lines used in coordinate geometry to locate a point in a plane or in space

3. anatomy the second cervical vertebra Compare atlas

4. botany the main central part of a plant, typically consisting of the stem and root, from which secondary branches and other parts develop

5. an alliance between a number of states to coordinate their foreign policy

6. Also called: principal axis. optics the line of symmetry of an optical system, such as the line passing through the centre of a lens

7. geology an imaginary line along the crest of an anticline or the trough of a syncline

8. crystallog one of three lines passing through the centre of a crystal and used to characterize its symmetry

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Axis ² British  

/ ˈæksɪs /

noun

1. 1. the alliance of Nazi Germany, Fascist Italy, and Japan, established in 1936 and lasting until their defeat in World War II

   2. ( as modifier )

      the Axis powers

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axis ³ British  

/ ˈæksɪs /

noun

1. any of several S Asian deer of the genus Axis, esp A. axis. They typically have a reddish-brown white-spotted coat and slender antlers

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axis Scientific  

/ ăk′sĭs /

• axes
  plural

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.

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axis ¹ Cultural  

1. In geometry, a straight line about which an object may rotate or that divides an object into symmetrical halves.

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axis ² Cultural  

1. An imaginary straight line passing through the North Pole, the center of the Earth, and the South Pole. The Earth rotates around this axis.

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Usage

Plural word for axis The plural form of axis is axes, pronounced [ ak-seez ]. The plurals of several other singular words that end in -sis are also formed in the same way, including hypothesis/hypotheses, analysis/analyses, and crisis/crises. A similar change is made when pluralizing appendix as appendices. Irregular plurals that are formed like axes derive directly from their original pluralization in Latin and Greek. Be careful: axes is also the plural of ax (and its alternate spelling axe), but in this case it’s pronounced [ ak-siz ]. Do you know: What is the plural of matrix?

Discover More

The axis of the Earth is an imaginary line drawn through the North Pole and the South Pole.

Other Word Forms

Derived Forms

• axised
  adjective
• unaxised
  adjective

Inflected Forms

Nouns

• axes
  plural
• axises
  plural

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Etymology

Origin of axis¹

First recorded in 1350–1400; Middle English; from Latin axis “an axletree, axle, axis”; see origin at axi-

Origin of axis²

First recorded in 1595–1605; from Latin axis “a wild animal of India, perhaps the spotted deer” (Pliny)

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Explanation

An axis is a straight line, sometimes seen, sometimes not, that is important in mathematics, art, science and our survival. The most famous axis is the one the earth spins around, giving us the 24-hour day. In graphs, one side is usually the "X axis" and the other the "Y axis." Axis lines are also the lines that run through spheres, like our earth, around which those spheres rotate. In a totally different area, axis is used to describe countries in an alliance. During World War II, Germany, Japan, and Italy were known as the Axis Powers.

Example Sentences

See Examples For:

axis Axis axes

It’s not your typical chart — the X axis is what’s called a signed-log scale, so you can see the huge values on the same axis as negative numbers.

From MarketWatch ● Oct. 13, 2026

In alternating, time-traveling, distinctly voiced chapters, the four quirky members of a modern Midwestern family spin on the tilted axis of Barbara, their dementia-impaired matriarch.

From Los Angeles Times ● Sep. 8, 2026

The Earth all but shifted on its axis following this, due to the breathtakingly bonkers discourse that followed the incident.

From Salon ● Sep. 8, 2026

As the main axis is there, I expect them to get very close to winning it again.

From BBC ● Sep. 7, 2026

So if the backbone was on the outside, the crystallographic repeat of 34 A had to represent the distance along the helical axis required for a complete rotation.

From "Double Helix" by James D. Watson

Iran built up the militias into a self-described Axis of Resistance to project power and keep fighting away from its borders.

From The Wall Street Journal ● Oct. 17, 2026

Roughly 90% of the ETF’s contracts are tied to a route connecting China with the Middle East, according to Alejandro Garza, founder and chief executive of Aztlan Equity Management, in an article in Axis Business.

From MarketWatch ● Oct. 9, 2026

Earlier, a number of specimens, including parts of the early dinosaur Thecodontosaurus, were destroyed in Bristol after an Axis raid in 1940.

From Science Daily ● Aug. 7, 2026

Eighty years ago, though the Arsenal of Democracy had vanquished the Axis and weathered a withering Depression, the recovering American people found themselves rich in bills but short on laughs.

From Los Angeles Times ● Jul. 25, 2026

Colonel Benjamin O. Davis Jr. and the 332nd Fighter Group took the war to the Axis powers from thirty thousand feet.

From "Hidden Figures" by Margot Lee Shetterly

But they were pushed back this week, and the government launched a counter-offensive into Tigrayan territory along three axes towards Mekelle, according to the Critical Threats Project, part of the American Enterprise Institute think tank.

From Barron's ● Oct. 3, 2026

By combining measurements taken along the axes of the jets, the team searched for H-alpha, a characteristic signature of ionized hydrogen gas.

From Science Daily ● Sep. 30, 2026

It is his Excalibur, his Andúril, the vaunted weapon only he can string and use to hit a bullseye through a row of twelve crossed axes.

From Salon ● Aug. 2, 2026

It ends a valuable deferred compensation program, axes health benefits and changes commissions on several types of policy, according to agents and company documents reviewed by the Journal.

From The Wall Street Journal ● Jun. 17, 2026

The crew were flailing away with their axes.

From "All the Light We Cannot See" by Anthony Doerr

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