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A lexeme (/ ˈ l ɛ k s iː m / ⓘ) 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 .
When a token class represents more than one possible lexeme, the lexer often saves enough information to reproduce the original lexeme, so that it can be used in semantic analysis. The parser typically retrieves this information from the lexer and stores it in the abstract syntax tree .
Instead, two related terms are used in morphology: lexeme and word-form [definition needed]. Generally, a lexeme is a set of inflected word-forms that is often represented with the citation form in small capitals. [7] For instance, the lexeme eat contains the word-forms eat, eats, eaten, and ate.
In morphology and lexicography, a lemma (pl.: lemmas or lemmata) is the canonical form, [1] dictionary form, or citation form of a set of word forms. [2] In English, for example, break, breaks, broke, broken and breaking are forms of the same lexeme, with break as the lemma by which they are indexed.
Lexicology examines every feature of a word – including formation, spelling, origin, usage, and definition. [1] Lexicology also considers the relationships that exist between words. In linguistics, the lexicon of a language is composed of lexemes, which are abstract units of meaning that correspond to a set of related forms of a word ...
Lexical items can be generally understood to convey a single meaning, much as a lexeme, but are not limited to single words. Lexical items are like semes in that they are "natural units" translating between languages, or in learning a new language. In this last sense, it is sometimes said that language consists of grammaticalized lexis, and not ...
For example, in English, the verb 'to walk' may appear as 'walk', 'walked', 'walks' or 'walking'. The base form, 'walk', that one might look up in a dictionary, is called the lemma for the word. The association of the base form with a part of speech is often called a lexeme of the word. Lemmatization is closely related to stemming.
A compound word is a lexeme composed of several established lexemes, whose semantics is not the sum of that of their constituents. They can be interpreted through analogy, common sense and, most commonly, context. [3] Compound words can have simple or complex morphological structures. Usually, only the head requires inflection for agreement.