A prefix is a letter or a group of letters that attaches to the beginning of a word and helps to indicate or modify its meaning. An easy example would be the word ‘prefix’ itself! It begins with the prefix pre-, which means ‘before’.
It is quite important to understand what different prefixes mean as they can help to understand the meanings of any new vocabulary. However, we do need to be careful, as sometimes a prefix can have more than one meaning!