Anaphora (linguistics) in the context of "Natural language processing"

The Anaphora (/əˈnæfərə/), Eucharistic Prayer, or Great Thanksgiving, is a portion of the Christian liturgy of the Eucharist in which, through a prayer of thanksgiving, the elements of bread and wine are consecrated. The prevalent historical Roman Rite form is called the "Canon of the Mass".

"Anaphora" is a Greek word (ἀναφορά) meaning a "carrying up", thus an "offering" (hence its use in reference to the offering of sacrifice to God). (This sense is distinct from the usage of "anaphora" in rhetoric and linguistics to mean a "carrying back".) In the sacrificial language of the Greek version of the Hebrew Bible known as the Septuagint, προσφέρειν (prospherein) is used of the offerer's bringing the victim to the altar, and ἀναφέρειν (anapherein) is used of the priest's offering up the selected portion upon the altar (see, for instance, Leviticus 2:14, 2:16, 3:1, 3:5).

In linguistics, deixis (/ˈdaɪksɪs, ˈdeɪksɪs/) is the use of words or phrases to refer to a particular time (e.g. then), place (e.g. here), or person (e.g. you) relative to the context of the utterance. Deixis exists in all known natural languages and is closely related to anaphora, with a sometimes unclear distinction between the two. In linguistic anthropology, deixis is seen as the same as, or a subclass of, indexicality.

The term's origin is Ancient Greek: δεῖξις, romanized: deixis, lit. 'display, demonstration, or reference'. To this, Chrysippus (c. 279 – c. 206 BCE) added the specialized meaning point of reference, which is the sense in which the term is used in contemporary linguistics.

Dynamic semantics is a framework in logic and natural language semantics that treats the meaning of a sentence as its potential to update a context. In static semantics, knowing the meaning of a sentence amounts to knowing when it is true; in dynamic semantics, knowing the meaning of a sentence means knowing "the change it brings about in the information state of anyone who accepts the news conveyed by it." In dynamic semantics, sentences are mapped to functions called context change potentials, which take an input context and return an output context. Dynamic semantics was originally developed by Irene Heim and Hans Kamp in 1981 to model anaphora, but has since been applied widely to phenomena including presupposition, plurals, questions, discourse relations, and modality.

Demonstratives (abbreviated DEM) are words, such as this and that, used to indicate which entities are being referred to and to distinguish these entities from others. They are typically deictic, their meaning depending on a particular frame of reference, and cannot be understood without context. Demonstratives are often used in spatial deixis (where the speaker or sometimes the listener is to provide context), but also in intra-discourse reference (including abstract concepts) or anaphora, where the meaning is dependent on something other than the relative physical location of the speaker. An example is whether something is currently being said or was said earlier.

Demonstrative constructions include demonstrative adjectives or demonstrative determiners, which specify nouns (as in Put that coat on), and demonstrative pronouns, which stand independently (as in Put that on). The demonstratives in English are this, that, these, those, and the archaic yon and yonder, along with this one, these ones, that one and those ones as substitutes for the pronouns.

A pro-drop language (from "pronoun-dropping") is a language in which certain classes of pronouns may be omitted when they can be pragmatically or grammatically inferable. The precise conditions vary from language to language, and can be quite intricate. The phenomenon of "pronoun-dropping" is part of the larger topic of zero or null anaphora. The connection between pro-drop languages and null anaphora relates to the fact that a dropped pronoun has referential properties, and so is crucially not a null dummy pronoun.

Pro-drop is a problem when translating to a non-pro-drop language such as English, which requires the pronoun to be added, especially noticeable in machine translation. It can also contribute to transfer errors in language learning.

In grammar, an antecedent is one or more words that identifies a pronoun or other pro-form. For example, in the sentence "John arrived late because traffic held him up," the word "John" is the antecedent of the pronoun "him." Pro-forms usually follow their antecedents, but sometimes precede them. In the latter case, the more accurate term would technically be postcedent, although this term is not commonly distinguished from antecedent because the definition of antecedent usually encompasses it. The linguistic term that is closely related to antecedent and pro-form is anaphora. Theories of syntax explore the distinction between antecedents and postcedents in terms of binding.

In linguistics, cataphora (/kəˈtæfərə/; from Greek, καταφορά, kataphora, "a downward motion" from κατά, kata, "downwards" and φέρω, pherō, "I carry") is the use of an expression or word that co-refers with a later, more specific expression in the discourse. The preceding expression, whose meaning is determined or specified by the later expression, may be called a cataphor. Cataphora is in contrast to anaphora which denotes cases where the order of the expressions is the reverse of that found in cataphora.

An example of cataphora in English is the following sentence: