A prefix is placed at the beginning of a word to modify or change its meaning.
A prefix is an affix which is placed before the stem of a word.[1] Particularly in the study of languages, a prefix is also called a preformative, because it alters the form of the words to which it is affixed. Prefixes, like other affixes, can be either inflectional, changing the syntactic category, or derivational, changing either the lexical category or the semantic meaning.[2] In English, there are no inflectional prefixes. Prefixes, like all other affixes, are bound morphemes.[1]