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Conversion (word formation)

In linguistics, conversion, also called zero derivation or null derivation, is a kind of word formation involving the creation of a word (of a new part of speech) from an existing word (of a different part of speech) without any change in form, which is to say, derivation using only zero.

Version
v1 · 2026-09-28 · History
Domain-specific #
8707
Domain group
Humanities
Origin domain
Linguistics & Semiotics
Subdomains
Morphology, Word Formation → Linguistics & Semiotics

Core Idea

Conversion (word formation) is treated here as the recurring socialscienceshumanitiesarts identity summarized by this source-grounded definition: In linguistics, conversion, also called zero derivation or null derivation, is a kind of word formation involving the creation of a word (of a new part of speech) from an existing word (of a different part of speech) without any change in form, which is to say, derivation using only zero. In linguistics, conversion, also called zero derivation or null derivation, is a kind of word formation involving the creation of a word (of a new part of speech).

How would you explain it like I'm…

Same Word, New Job

Sometimes a word changes jobs without changing how it looks. 'Clean' can describe something, like a clean shirt, and it can also be something you do: 'Let's clean up!' Making a new kind of word from an old word, without adding or changing any letters, is called conversion.

Words That Switch Jobs

Words come in different kinds, called parts of speech, like nouns (things), verbs (actions), and adjectives (describing words). Conversion is when an existing word starts being used as a different part of speech without changing its spelling or form at all. For example, the describing word 'clean' became the action word 'to clean'. 'Access' was only a thing, as in 'gain access', until people started saying 'access the file'. Because nothing is added, linguists also call it 'zero derivation'.

Zero Derivation

In linguistics, conversion, also called zero derivation or null derivation, is a way of forming words in which a word of one part of speech becomes a word of a different part of speech without any change in form. Normally derivation adds something, like '-ify' turning 'verb' into 'verbify'; in conversion the added piece is effectively zero. Adjectives becoming nouns and nouns becoming adjectives is common in English and rarely noticed, as with the golf noun 'green' coming from the adjective 'green'. Turning nouns or other words into verbs, called verbification or 'verbing', gets more attention: 'clean' the adjective gives 'to clean', and 'access' the noun gives 'to access'. The verb 'to verb' is itself an example of conversion. The key test is that the part of speech changes while the form stays the same.

 

In linguistics, conversion (zero or null derivation) is word formation that creates a lexeme of a new part of speech from an existing one of a different part of speech with no change in form; it can be analyzed as derivation using only a zero affix. English uses it extensively. Adjective-to-noun and noun-to-adjective conversions are common and largely unnoticed, as with the golf noun 'green', ultimately from the adjective. More remarked on is verbification, creating verbs from nouns, adjectives or other words: 'clean' (adjective) to 'to clean', 'access' (noun, 'gain access to the file') to 'access the file'. Verbification is not confined to slang and has contributed many ordinary expressions. The verbs 'to verbify' (formed with an affix) and 'to verb' (formed by conversion) are themselves products of verbification, so they are autological; 'to verb' is often reserved specifically for verbification without a change in form. The defining test is category change with identical form, distinguishing conversion from affixal derivation.

Scope of Application

  • In English. (Later this was extended to forming verbs from Latin passive participles even if they were not used as adjectives.).

  • In constructed languages. In Toki Pona, any content word may function as a noun, verb or adjective depending on syntax; for example, moku may mean food, to eat, or edible.

  • In English. The verbs to verbify and to verb, the first by derivation with an affix and the second by zero derivation, are themselves products of verbification (see autological word), and the term.

  • Humor. Verbification is sometimes used to create nonce words or joking words.

  • Humor. Often, simple conversion is involved, as with formations like beer, as in beer me ("give me a beer") and eye, as in eye it ("look at it"), although "to eye" in.

Clarity

A clear use of Conversion (word formation) names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is In linguistics, conversion, also called zero derivation or null derivation, is a kind of word formation involving the creation of a word (of a new part of speech) from an existing word (of a different part of speech) without any change.

Manages Complexity

Conversion (word formation) compresses multiple socialscienceshumanitiesarts details into a stable diagnostic relation. The source shows both the central mechanism—many English nouns are formed from unmodified verbs: a fisherman's catch, to go for a walk, etc.—and the practical consequence—verbification, or verbing, is the creation of a verb from a noun, adjective or other word. This compression makes cases comparable while leaving parameters, conventions, exceptions, and evidential quality explicit.

Abstract Reasoning

  1. Type the carrier. Identify the socialscienceshumanitiesarts entities to which the claim applies.
  2. State the relation. Use the source-grounded identity: In linguistics, conversion, also called zero derivation or null derivation, is a kind of word formation involving the creation of a word (of a new part of speech) from an existing word (of a different part of speech) without any change in form, which is to say, derivation using only zero.
  3. Check operation and conditions.

Knowledge Transfer

Within the home domain. Knowledge about Conversion (word formation) transfers literally when a new case preserves the same carrier type, relation, and recognition test. (Later this was extended to forming verbs from Latin passive participles even if they were not used as adjectives.). In Toki Pona, any content word may function as a noun, verb or adjective depending on syntax; for example, moku may mean food, to eat, or edible. Beyond the home domain. No canonical parent is asserted for Conversion (word formation).

Neighborhood in Abstraction Space

Conversion (word formation) sits in a sparse region of the domain-specific corpus (91st percentile for distinctiveness): few abstractions share its structure, so a faithful description tends to retrieve it precisely.

Family — Grammatical Case & Reference (10 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08