Notes on Derivational morphology in NLP

Derivational morphology in natural language processing

Derivational Morphology

Derivation is the process of creating new words from a stem/base form of a word.

• One of the most common ways to derive new words is to combine derivational affixes with root words (stems). The new words formed through derivational morphology may be a stem for another affix.

• We would say, new words are derived from the root words in this type of morphology.

• English derivation is one of the complex derivations. It is because of one or more of the following reasons;
• Less productive. That is, a morpheme added with a set of verbs to make new meaningful words cannot always be added with all verbs. For example, the base word 'summarize' can be added with the grammatical morpheme '-ation' results in a word 'summarization' whereas this morpheme cannot be added with all the verbs to make similar effects.
• Complex meaning differences among nominalizing suffixes. For example, the words 'conformation' and 'conformity' both derived from the word stem 'conform' but meanings are entirely different.

• Derivation creates different words from the same lemma.

Example:

Category	Stem	Affixes	Derived word	Target category
Noun	vapor	-ize	vaporize	Verb
Verb	read	-er	reader	Noun
Adjective	real	-ize	realize	Verb
Noun	mouth	-ful	mouthful	Adjective

Useful External Link: Essentials of linguistics

***********

• Go to Morphology in Natural Language Processing page

• Go to Inflectional Morphology page

• Go to Notes on Natural Langue Processing Home page

• Go to Natural Language Processing Glossary

Define derivational morphology in nlp

What is derivational morphology in natural language processing

How new words are derived to form a different word?

Study of morphemes and  their uses in natural language processing

example of derivational morphology in nlp

What is the role of derivational morphology in nlp