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.

above the mesopause, at a height of 130 km.

a method of determining the concentration of an acid or base by neutralising it with a base or...

elements whose valence electrons are accommodated in the d orbitals.

when a nucleus decays and forms a new element.

molecule where the ratio of atoms is 1 : 5, for example PCl5

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