What is a derivational morpheme?

Answer

A derivational morpheme is a type of morpheme that changes the meaning of a word, its part of speech or both, according to About.com. These morphemes can be either prefixes or suffixes.

For example, adding the derivational morpheme "-ly" to the adjective "hateful" changes it into "hatefully," which is an adverb. Similarly, adding the derivational morpheme "un-" to the beginning of "explained" as a prefix changes it to "unexplained," which has a different meaning from the original word. One word can have more than one derivational morpheme, such as "unintentional," which uses the morphemes "un-" and "-al" to create a new adjective out of the noun "intention." Derivational morphemes differ from inflectional morphemes in that the latter change the function of a word, but not its meaning or part of speech.

Q&A Related to "What is a derivational morpheme?"
An easy way to remember what a morpheme is is that a morpheme can't get any smaller than it already is. It's kind of like a paycheck after taxes are taken out. The only difference
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A morpheme is a word or a word element that cannot be divided into smaller meaningful parts. In the word "singing," sing is a morpheme and ing is a morpheme. In the word
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A morpheme is the smallest meaningful unit in the grammar of a
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(môr'fēm') n. A meaningful linguistic unit consisting of a word, such as man, or a word element, such as -ed in walked, that cannot be divided into smaller meaningful parts
http://www.answers.com/topic/morpheme
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