easy
The x-axis runs horizontally across the coordinate plane.
What does Axis mean?
An axis is a reference line on a graph or a line around which something turns or is symmetrical.
Dictionary definition
A real or imaginary reference line used to locate or measure values, a line around which something turns, or a line through which a figure is symmetrical. Axis also has specialized anatomy, botany, optics, and political uses.
Example sentences
Axis in a sentence
medium
Earth rotates around an imaginary axis.
medium
The vertical line is an axis of symmetry for the figure.
hard
On the graph, the vertical axis shows temperature in degrees Celsius.
Writing practice
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Quick practice
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Practice the meaning of Axis
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
What is the horizontal axis on a coordinate plane called?
The x-axis is horizontal; the y-axis is vertical.
Practice 2
Where do the x-axis and y-axis meet?
The axes intersect at (0, 0), called the origin.
Practice 3
What does Earth’s axis describe?
Earth spins around its rotational axis.
Practice complete
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Pronunciation coach
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Axis
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Sounds like
ak · sis · strongest beat: ak
Tap each sound part, then blend the whole word together.
Learn
WordAxis.
Partnoun.
MeaningAxis means An axis is a reference line on a graph or a line around which something turns or is symmetrical.
ExampleExample: The x-axis runs horizontally across the coordinate plane.
Word breakdown
2 syllables. Say each part, then blend the word.
- Syllables
- ak · sis
- Strongest beat
- ak
- Ending
- sis
- Tip
- Put a little extra energy on ak.
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Synonym review
Does Axis have synonyms?
Axis has no precise synonym across its graph, rotation, and symmetry senses. Reference line, centerline, and line of symmetry explain particular uses but are not interchangeable in every context.
Antonym review
Does Axis have an opposite?
Axis names a reference, rotation, or symmetry line and has no direct antonym. Edge and surface name different geometric features, not opposites.
Word family
Axis word family
Base word
axis
noun
axes
The plural of axis.
adjective
axial
Related to or arranged around an axis.
Related words
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Student support
Understand Axis
Hint for students
On a coordinate plane, x is horizontal and y is vertical; they meet at the origin. Read each axis label and scale before reading a graph.
Common mix-up
The plural of axis is axes, pronounced AK-seez. An axis is not a coordinate, an outer edge, or automatically a line of symmetry.
Try it in class or at home
Label axes, origin, units, and scale on a blank graph, then sketch a figure and test whether it has an axis of symmetry.
Teacher prompt
Compare a graph axis, Earth's rotational axis, and an axis of symmetry. Ask what the line helps people reference or understand in each case.
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