Derivation is the word formation process in which a derivational affix attaches to the base form of a word to create a new word. Affixes, which include prefixes and suffixes, are bound morphemes. Morphemes are the smallest linguistic unit of a language with semantic meaning. Bound morphemes, unlike free morphemes, cannot stand alone but must attach to another morpheme such as a word. For example, the following two lists provide examples of some common prefixes and suffixes with definitions in English