Neoclassical compoundNeoclassical compounds are compound words composed from combining forms (which act as affixes or stems) derived from classical languages (classical Latin or ancient Greek) roots. Neo-Latin comprises many such words and is a substantial component of the technical and scientific lexicon of English and other languages, via international scientific vocabulary (ISV). For example, Greek bio- combines with Latin -graphy to form biography ("life" + "writing/recording").
Nonconcatenative morphologyNonconcatenative morphology, also called discontinuous morphology and introflection, is a form of word formation and inflection in which the root is modified and which does not involve stringing morphemes together sequentially. Apophony Ablaut and Umlaut (linguistics) In English, for example, while plurals are usually formed by adding the suffix -s, certain words use nonconcatenative processes for their plural forms: foot /fʊt/ → feet /fiːt/; Many irregular verbs form their past tenses, past participles, or both in this manner: freeze /ˈfriːz/ → froze /ˈfroʊz/, frozen /ˈfroʊzən/.
Null morphemeIn morphology, a null morpheme or zero morpheme is a morpheme that has no phonetic form. In simpler terms, a null morpheme is an "invisible" affix. It is a concept useful for analysis, by contrasting null morphemes with alternatives that do have some phonetic realization. The null morpheme is represented as either the figure zero (0) or the empty set symbol ∅. In most languages, it is the affixes that are realized as null morphemes, indicating that the derived form does not differ from the stem.
