a number which combined with its inverse results in the identity 1, e.g. 4 × ¼ = 1.

# Find Definitions

## Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

- First click on the letters of the alphabet to browse for terms.
- Select a subject from the drop-down menu above to filter the terms by Subject.
- Or lastly, type the term you are looking for into the search box.

**EXAMPLES**

Here are some examples of the kinds of definitions you’ll find on this page.

Subject:

a graph in which you replace the *x*-values with the *y*-values and the* y...*

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Subject:

a function that produces the size of an angle, given one of the angle's trigonometric ratios: If...

Subject:

if one variable increases, the other variable decreases at a fixed rate.

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