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:

a grid using block references

Subject:

height above sea level

Subject:

a line drawn from the vertex of a triangle perpendicular to the side opposite the vertex.

Subject:

a cumulus cloud at an intermediate altitude

Subject:

small air-filled sac-like structures from which the lungs are made

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