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.

Subject:

total length of streams in relation to area

Subject:

pattern made by the way in which tributaries join the main stream

Subject:

when the total rainfall in a year falls below 75% of the annual average

Subject:

a vertical or near-vertical wall-like body of igneous rock intruded into cracks in older rock;...

Subject:

pressure that is due either to the convergence and rising of air, or to the subsidence of air...

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