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:

aerial photograph taken at 60°-90° to the vertical

Subject:

GIS scale that allows you to see more detail of an area

HIV
Subject:

Human Immunodeficiency Virus

Subject:

a homoclinal ridge with a steeper dip slope, at more than 45º to the horizontal

Subject:

a mountain that has an asymmetrical appearance (a gentle dip slope at 25-45° to the horizontal...

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