ATLAS OF LANGUAGE

AT-088-009 · ATLAS 260

Conversion

The change in part of speech without a visible derivational element.

Part of the subject path Morphology and Word Formation

Why is this entry in the Atlas?

F · Figure / procedure R1 · Distinct contribution to understanding

Conversion identifies category change without an overt derivational element. It directs testing towards grammatical environment and function, preventing unchanged appearance from being mistaken for unchanged lexical behaviour.

Colours and admission grounds

The rectangular label identifies the entry function: F – linguistic figure or procedure; A – analytical concept; G – foundational concept; E – selected concrete case. The rounded badge indicates the admission ground: R1 – distinctive contribution; R2 – necessary foundation; R3 – justified illustrative case. This editorial rationale explains the current selection rather than claiming an undocumented original selection history.

Explanation

Conversion is the shift of a lexeme into another word class without the addition of an overt derivational element. When English “to email” develops from the noun “email,” the perceptible base remains unchanged while its grammatical possibilities shift. The new category is therefore diagnosed not by an attached morpheme but by inflection, position, complementation, and syntactic function. The term zero derivation foregrounds this absence of overt material, yet it should not obscure the systematic categorical change involved. Cross-linguistic analysis requires caution: what is treated as conversion in one language may be better explained in another through inflection, covert morphology, or flexible word classes. The concept reveals a movement in which the same form enters a new grammatical field of possibilities.

Movement of thought

1. A lexical form first appears in an established word class with the syntactic and inflectional possibilities typical of that class. 2. The same perceptible base is used without an added derivational marker in a position associated with another word class. 3. Inflection, combination, complementation, and sentence function reveal the category shift even though the word form displays no new segment. 4. A counter-test examines overt affixes, inflection alone, ellipsis, and flexible-word-class analyses before positing unmarked derivation. 5. The unchanged form returns with altered grammatical powers, showing that identity of shape does not entail identity of function.

Scientific use case

Morphology and syntax investigate conversion through distribution, inflection, productivity, and lexical meaning. Corpus evidence and cross-linguistic comparison help decide among zero derivation, flexible word class, and competing analyses.

Example

In “They emailed the revised plan,” the noun-shaped base “email” functions as an inflecting verb and takes a direct object without receiving a derivational suffix.

Counterexample

English “runner” is formed from “run” with the overt suffix -er. It involves a category-changing derivation, but not conversion without visible derivational material.

Distinction

Distinguish conversion from overt affixal derivation, inflection within one word class, nominalisation as a possible subtype, ellipsis, and lexemes that are inherently class-flexible. Category change without overt derivational material is decisive.

Effect on thought and perception

Conversion redirects attention from visible word pieces toward grammatical environments and shows how a stable form can be categorically reinterpreted through new functions.

Resonance

The word shape remains in place while its syntactic surroundings answer it differently; a new grammatical identity emerges from that displacement without a visible seam.

Cite this entry

Reich, Michael (Hrsg./ed.): „Conversion“. Atlas der Sprache, AT-088-009. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-088-009

https://atlasoflanguage.com/concept/AT-088-009

The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.

Historical background

Sapir analyses farmer through an activity expressed by to farm, itself related to the object or institution named by a farm. The sequence makes it possible to discuss a category change even where no overt derivational ending separates noun and verb. He also warns that parts of speech must be studied through the formal possibilities of a language rather than read directly from reality. This offers conceptual background for conversion, not proof of a historical derivation direction for every pair or an English coinage date. The Atlas should distinguish a present structural relationship from a documented historical transfer between categories. A noun and verb that now look identical may have different histories. The source helps formulate that question but does not settle all competing analyses of zero marking.

How conceptual history changes the analysis

Conversion is a category change without overt derivational marking; its synchronic structure does not by itself establish the historical direction of derivation.

References for the historical section

  • Edward Sapir, Language (1921), Gutenberg transcription with 1939 printing information · Chapter V: a farm, to farm and farmer; discussion of parts of speech

    Selected passage, not a complete genealogy or an English first-attestation claim. Original Atlas applications are editorial interpretations, not reported experiments. The inspected transcription carries 1921 copyright and later printing information; no first-edition collation. Historical language names and generalisations require modern checking.

Historical source evidence and Atlas applications remain separate; this import does not assert new first attestations or a fresh exhaustive source verification.