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:

means 'the sum of .. .'

Subject:

the first non-zero digit in a decimal fraction. It can appear before or after the decimal comma...

a letter that is not pronounced, e.g. gnome, knowledge.

Subject:

horizontal sheet of dolerite rock that has cooled between the bedding planes of rock strata

Subject:

layer of the crust beneath the continents and oceans

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