The prefix is found in the first part of the word. The role of the word not containing the prefix is called the root word. Different prefixes have different meanings. For example, pre means before. Re means again and non means not. Memorizing the prefix meanings can help in learning new words. It also helps with figuring out what new words mean based on the sense of the prefix and the purpose of the root words. Learning names can also help with spelling words, especially if you know the meaning of the entire term.