Prefix

A prefix is an affix which is placed previously the stem of a word. Adding it to the beginning of one word alter it into another word. For example, when the prefix un- is added to the word happy, it creates the word unhappy. especially in the analyse of languages, a prefix is also called a preformative, because it alters the develope of the words to which this is the affixed.

Prefixes, like other affixes, can be either inflectional, devloping a new pull in of the word with the same basic meaning and same lexical category but playing a different role in the sentence, or derivational, creating a new word with a new semantic meaning in addition to sometimes also a different lexical category. Prefixes, like any other affixes, are usually bound morphemes.

In English, there are no inflectional prefixes; English uses suffixes instead for that purpose.

The word prefix is itself exposed up of the stem fix meaning "attach", in this case, and the prefix pre- meaning "before", both of which are derived from Latin roots.

English language

This is a fairly comprehensive, although not exhaustive, list of derivational prefixes in English. Depending on exactly how one defines a derivational prefix, some of the neoclassical combining forms may or may not qualify for inclusion in such a list. This list takes the broad idea that acro- and auto- count as English derivational prefixes because they function the same way that prefixes such as over- and self- do.

As for Numeral prefix > Table of number prefixes in English.

binomial, "two terms"

dipole, "two poles"

The alternative between hyphenation or solid styling for prefixes in English is forwarded at Hyphen > Prefixes and suffixes.