axis
Pronunciation
Noun
B1 Intermediate
Quick answer
An imaginary straight line around which an object rotates, or a fixed line of reference used in a graph.
Usage notes
In a graph, the horizontal line is called the x-axis and the vertical line is the y-axis.
Test yourself
Which word fits the gap? "The earth rotates on its _____ once every twenty-four hours."
Answer: axis
In your own words, what does "axis" mean?
An imaginary straight line around which an object rotates, or a fixed line of reference used in a graph.
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