Lexeme

A lexeme (/ˈlɛksiːm/ (listen)) is a unit of lexical meaning that underlies a set of words that are related through inflection. It is a basic abstract unit of meaning,[1] a unit of morphological analysis in linguistics that roughly corresponds to a set of forms taken by a single root word. For example, in English, run, runs, ran and running are forms of the same lexeme, which can be represented as RUN.[note 1]

One form, the lemma (or citation form), is chosen by convention as the canonical form of a lexeme. The lemma is the form used in dictionaries as an entry's headword. Other forms of a lexeme are often listed later in the entry if they are uncommon or irregularly inflected.

Description

The notion of the lexeme is central to morphology,[2] the basis for defining other concepts in that field. For example, the difference between inflection and derivation can be stated in terms of lexemes:

• Inflectional rules relate a lexeme to its forms.
• Derivational rules relate a lexeme to another lexeme.

A lexeme belongs to a particular syntactic category, has a certain meaning (semantic value) and, in inflecting languages, has a corresponding inflectional paradigm. That is, a lexeme in many languages will have many different forms. For example, the lexeme RUN has a present third person singular form runs, a present non-third-person singular form run (which also functions as the past participle and non-finite form), a past form ran, and a present participle running. (It does not include runner, runners, runnable etc.) The use of the forms of a lexeme is governed by rules of grammar. In the case of English verbs such as RUN, they include subject-verb agreement and compound tense rules, which determine the form of a verb that can be used in a given sentence.

In many formal theories of language, lexemes have subcategorization frames to account for the number and types of complements. They occur within sentences and other syntactic structures.

Decomposition

A language's lexemes are often composed of smaller units with individual meaning called morphemes, according to root morpheme + derivational morphemes + suffix (not necessarily in that order), where:

• The root morpheme is the primary lexical unit of a word, which carries the most significant aspects of semantic content and cannot be reduced to smaller constituents.[3]
• The derivational morphemes carry only derivational information.[4]
• The suffix is composed of all inflectional morphemes, and carries only inflectional information.[5]

The compound root morpheme + derivational morphemes is often called the stem.[6] The decomposition stem + desinence can then be used to study inflection.

See also

• Ending (linguistics)
• Inflection
• Lexical word vs. grammatical word
• Marker (linguistics)
• Multiword expression
• Null morpheme
• Root (linguistics)
• Stem
• Word family

Notes

1. RUN is here intended to display in small caps. Software limitations may result in its display either in full-sized capitals (RUN) or in full-sized capitals of a smaller font. Either is regarded as an acceptable substitute for genuine small caps.

References

1. The Cambridge Encyclopedia of The English Language. Ed. David Crystal. Cambridge: Cambridge University Press, 1995. p. 118. ISBN 0521401798.
2. Bonami O, Boyé G, Dal G, Giraudo H, Namer F, eds. (2018). The lexeme in descriptive and theoretical morphology (pdf). Berlin: Language Science Press. doi:10.5281/zenodo.1402520. ISBN 978-3-96110-110-8.
3. "SIL dictionary of linguistic terms: What is a root?". Sil.org. Retrieved 2018-07-31.
4. "SIL dictionary of linguistic terms: What is a derivational affix?". Sil.org. Retrieved 2018-07-31.
5. "SIL dictionary of linguistic terms: What is an inflectional affix?". Sil.org. Retrieved 2018-07-31.
6. "SIL dictionary of linguistic terms: What is a stem?". Sil.org. Retrieved 2018-07-31.

External links

• The dictionary definition of lexeme at Wiktionary