Glossary

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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.

origin

Subject:

the point of intersection between the x-axis and the y-axis that is denoted by...

Subject:

English First Additional Language , English Home Language

see etymology.

orographic rain

Subject:

(also called relief rain) rain that occurs when air rises up the windward side of a mountain and...

Subject:

the point of intersection of two or more altitudes in a triangle.

orthophoto

Subject:

(also called an orthophoto map) a combination of a vertical aerial photograph and a map

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