The morphological relation between `sing' and `singer' and `song' is derivational.    From Wordnet, Princeton University. 

'Unpacked' has a much closer (for me) affinity with 'unpack' (derivational) than with 'packed' (inflectional).    From Wordnik.com.  [languagehat.com: STILL UNPACKED.] Reference

Pre - fixes, derivational suffixes, and inflexional affixes were accurately described and their function defined.    From Wordnik.com.  [STUDY OF LANGUAGE] Reference

The application of a filler vowel -a- between the derivational suffix -χ and the noun stem is also within reason.    From Wordnik.com.  [Those Mysterious Sovanians] Reference

It sure is a tempting etymology though but it's messier than attributing it to the attested verb ar plus derivational -ax.    From Wordnik.com.  [Etruscan araχ: a falcon, a hawk, both?] Reference

Even, say, including the derivational and conjugational endings as entries in the dictionary would be, really, really handy.    From Wordnik.com.  [Etruscan citynames] Reference

I think the usage and etymology of this word can best be explained as consisting of fler "gift" and the derivational suffix -iś.    From Wordnik.com.  [New "update page" for news on Etruscan Glossary Draft 001] Reference

I have quoted the portion above to show the way in which the Medieval derivational approach augments in an interesting way Moravscik's Modal Approach.    From Wordnik.com.  [Aristotle's Categories] Reference

Others may be related to derivational morphology the method of creating a new word from an old word by adding an affix; e.g., happy - happiness, employ - employee.    From Wordnik.com.  [Psychic word learning. No, seriously.] Reference

The last approach to the categories, namely the Medieval derivational approach, goes some way in the direction suggested but not taken by Moravscik's Modal Approach.    From Wordnik.com.  [Aristotle's Categories] Reference

In the minimalist framework, lexicon has the numeration set, which comprises the lexical categories, functional categories and the inflectional and derivational suffixes.    From Wordnik.com.  [Archive 2008-10-01] Reference

The apparent etymology gives us no clue either since if this is a native word, it would divide into ar 'to lift up' and -aχ, a derivational suffix with a patientive meaning.    From Wordnik.com.  [Archive 2008-06-01] Reference

In summary, philosophers of biology agree that the relations between Mendelian genetics and molecular biology are not appropriately analyzed via derivational intertheoretic reduction.    From Wordnik.com.  [Molecular Biology] Reference

Vietnamese isn't as isolating as you might think, there's a rich derivational morphology that's barely understood and partially hidden by the practice of writing by syllable rather than word.    From Wordnik.com.  [languagehat.com: GENDER DIFFERENCES IN CHINESE.] Reference

Waters thus defended “informal reduction,” in which molecular models of crossing-over between homologous chromosomes were shown to be explanatory, even though no derivational reduction was involved.    From Wordnik.com.  [Molecular Biology] Reference

Kenneth Schaffner used and developed Ernst Nagel's (1961) analysis of derivational theory reduction to argue for the reduction of classical Mendelian genetics (T2) to molecular biology (T1) and refined it over many years.    From Wordnik.com.  [Molecular Biology] Reference

Free Morpheme, Bound Morpheme, Inflectional morpheme, & derivational morpheme?.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

Most languages that possess no derivational affixes of any sort may nevertheless freely compound radical elements (independent words).    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

The derivational element - ihl “in the house” does not mitigate this vagueness or generality; inikw-ihl is still “fire in the house” or “burn in the house.    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

In its current state the MTE tagset includes information from different levels of language description: purely morphological, derivational, syntactic and semantic.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Corresponding to these two modes of expression we have two types of concepts and of linguistic elements, radical (farm, kill, duck) and derivational (- er, - ling).    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

↑ The existence of words like appendix and pending in English does not mean that the English word depend is analyzed into a derivational prefix de - and a root pend.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

By a “fusional-agglutinative” language we would understand one that fuses its derivational elements but allows a greater independence to those that indicate relations.    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

In a word like independently, we say that the morphemes are in -, depend, - ent, and ly; depend is the root and the other morphemes are, in this case, derivational affixes.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

The ideas expressed by these mediating elements—they may be independent words, affixes, or modifications of the radical element—may be called “derivational” or “qualifying.    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

In this short sentence of five words there are expressed, therefore, thirteen distinct concepts, of which three are radical and concrete, two derivational, and eight relational.    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

From the standpoint of the sentence the derivational elements - er and - ling are merely details in the local economy of two of its terms (farmer, duckling) that it accepts as units of expression.    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

But what prevents us from throwing in these “dispensable” or “secondary” relational concepts with the large, floating group of derivational, qualifying concepts that we have already discussed?.    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

For such languages the number concept has no syntactic significance whatever, is not essentially conceived of as defining a relation, but falls into the group of derivational or even of basic concepts.    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

This is also true of many languages of type B, the terms “agglutinative, ” “fusional, ” and “symbolic” applying in their case merely to the treatment of the derivational, not the relational, concepts.    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

One example of derivation is clear in this case: the word independent is derived from the word dependent by prefixing it with the derivational prefix in -, while dependent itself is derived from the verb depend.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

A language of markedly mixed-relational type, but of little power of derivation pure and simple, such as Bantu or French, may be conveniently put into type C, even though it is not devoid of a number of derivational affixes.    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

Setting aside the fact that they belong to the sphere of derivational concepts and do not touch the central morphological problem of the expression of relational ideas, they have added nothing to the structural peculiarities of our language.    From Wordnik.com.  [Chapter 9. How Languages Influence Each Other] Reference

14 In Nootka we have an unusually large number of derivational affixes (expressing concepts of group II).    From Wordnik.com.  [Chapter 5. Form in Language: Grammatical Concepts] Reference

Rohrlich has defended a similar realist position about weaker, conceptual (cognitive) antireductionism, although on grounds of mathematical success of derivational explanatory reductions (Rohrlich.    From Wordnik.com.  [The Unity of Science] Reference

18 As far as Latin and Greek are concerned, their inflection consists essentially of the fusing of elements that express logically impure relational concepts with radical elements and with elements expressing derivational concepts.    From Wordnik.com.  [Chapter 6. Types of Linguistic Structure] Reference

(i.e., unlisted in Wentworth and Flexner's Dictionary of American Slang) derivational morphemes in action (all are from the Detroit Free Press).    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol III No 4] Reference

I need an example of a derivational English noun.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference