Information about Lemma (linguistics)

The word lemma has a different meaning in logic and in mathematics.

In linguistics a lemma is the canonical form of a lexeme.

Specifically, in lexicography, "lemma" is a synonym for headword, q.v.

In morphology, a lemma is the canonical form of a lexeme. Lexeme, in this context, refers to the set of all the forms that have the same meaning, and lemma refers to the particular form that is chosen by convention to represent the lexeme. Lemmas have special significance in highly inflected languages such as Czech. In this sense, a lemma can also be called a citation form. The process of determining the lemma for a given word is called lemmatisation.

In psycholinguistics, the term lemma has a more restricted use: it is an abstract form of a word that is used in speech production. In the best accepted psycholinguistic models, speech production has several stages, and the lemma occurs after the word has been selected mentally, but before any information has been accessed about the sounds in it (and thus before the word can be pronounced). It therefore contains information concerning only meaning and the relation of this word to others in the sentence.

Morphology

In a dictionary, the lemma "go" represents the inflected forms "go", "goes", "going", "went", and "gone". The relationship between an inflected form and its lemma is usually denoted by an angle bracket, e.g. "went" < "go". The disadvantage of such simplifications is, of course, the inability to look up a declined or conjugated form of the word, although some dictionaries, like Webster's, will list "went". Multilingual dictionaries vary in how they deal with this issue: the Langenscheidt dictionary of German does not list ging (< gehen); the Cassell does.

The form that is chosen to be the lemma is usually the least marked form. There are significant exceptions; e.g. in Finnish, the dictionaries lists verbs not under the verb root, but under the first infinitive marked with -(t)a, -(t)ä.

Lemmas are used often in corpus linguistics for determining word frequency. In such usage the specific definition of "lemma" is flexible depending on the task it is being used for.

Lemmas in different languages

In English, the citation form of a noun is the singular: e.g. mouse rather than mice. For multi-word lexemes which contain possessive adjectives or reflexive pronouns, the citation form uses a form of the indefinite pronoun one: e.g. do one's best, perjure oneself. In languages with grammatical gender, the citation form of regular adjectives and nouns is usually the masculine singular. If the language additionally has cases, the citation form is often the masculine singular nominative.

In many languages, the citation form of a verb is the infinitive: French aller, German gehen. In English we can use either the bare infinitive go or the full infinitive to go. In Latin and Greek, however, the first person singular present tense is normally used, though occasionally the infinitive may also be seen. (For contracted verbs in Greek, an uncontracted first person singular present tense is used to reveal the contract vowel, e.g. φιλέω philéō for φιλῶ philō "I love" [implying affection]; αγαπάω agapáō for αγαπῶ agapō "I love" [implying regard]).

In Arabic, which has no infinitives, the third person singular of the past tense is the least-marked form, and is used for entries in modern dictionaries. In older dictionaries, which are still commonly used today, the triliteral of the word, either a verb or a noun, is used. Hebrew often uses the 3rd person masculine qal perfect, e.g. ברא bara' create, כפר kaphar cover. For Korean, -da is attached to the stem.

Some phrases are cited in a sort of lemma, e.g. Carthago delenda est (literally, "Carthage is destroyed") is a common way of citing Cato, although what he said was more like, Ceterum censeo Carthaginem esse delendam ("As to the rest, I hold that Carthage must be destroyed").

Psycholinguistics

When we produce a word, we are essentially turning our thoughts into sounds (a process known as lexicalisation). In many psycholinguistic models this is considered to be at least a two-stage process. The lemma is thus intermediate between the semantic level (where meaning is specified) and the phonological level (where the sounds of the word are specified). It is an abstract form containing syntactic information (about how the word can be used in a sentence), but no information about the pronunciation of the word. In this context, the lexeme is the phonologically specified form that is selected after the lemma.

This two-staged model is the most widely supported theory of speech production in psycholinguistics^[1], although it has been recently challenged.^[2] For example, there is some evidence to indicate that the grammatical gender of a noun is retrieved from the word's phonological form (the lexeme) rather than from the lemma.^[3] This is easily explained by Caramazza's Independent Network model, which does not assume a distinct level between the semantic and the phonological stages (so there is no lemma representation); in this model, syntactic information about the word in this model is activated in the semantic or phonological level (so gender would be activated in the latter).^[4]

See also

• Linguistics
• Corpus linguistics
• Morphology
• Psycholinguistics
• Markedness
• Principal parts
• Root (linguistics)
• Null morpheme
• Lemmatisation
• Lexeme
• Uninflected word

References

External links

• Lemma vs lexeme