alteration; change.
"The daily temperature varies significantly depending on whether it rains or stays sunny."
In plain English: There is no noun form of the word vary because it is only used as a verb to describe changing or being different.
"The variety in their answers was surprising."
be subject to change in accordance with a variable
"Prices vary"
"His moods vary depending on the weather"
To change with time or a similar parameter.
"The temperature varies significantly throughout the day in this mountain region."
In plain English: To vary means to change or make something different from what it was before.
"The prices vary depending on the season."
Usage: Use vary to describe something that changes in amount, degree, or nature over time rather than staying the same. It is often paired with from and to when specifying the range of differences observed.
The word vary comes from the Latin verb variō, meaning "to change" or "alter." It entered English through Middle English and Old French, carrying its original sense of making things different.