In linguistics the catena (Latin for 'chain', plural catenae) is a unit of syntax and morphology, closely associated with dependency grammars. It is a more flexible and inclusive unit than the constituent and may therefore be better suited than the constituent to serve as the fundamental unit of syntactic and morphosyntactic analysis. The catena concept was introduced to linguistics by William O'Grady in 1998 and has been seized upon by some other linguists and applied to the syntax of idiosyncratic meaning of all sorts, to the syntax of ellipsis mechanisms (e.g. gapping, stripping, VP-ellipsis, pseudogapping, sluicing, answer ellipsis, comparative deletion), to the syntax of predicate-argument structures, and to the syntax of discontinuities (topicalization, wh-fronting, scrambling, extraposition, etc.).
The catena is defined as follows:
- Any element (word or morph) or any combination of elements that are continuous in the vertical dimension (y-axis)
In terms of graph theory, any syntactic tree or connected subgraph of a tree is a catena. In this regard, every constituent is a catena, but there are many catenae that are not constituents. The constituent is therefore a subtype of catena. Any individual element (word or morph) or combination of elements linked together in the vertical dimension is a catena. Sentence structure is conceived of as existing in two dimensions. Combinations organized along the horizontal dimension (in terms of precedence) are called strings, whereas combinations organized along the vertical dimension (in terms of dominance) are catenae. In terms of a cartesian coordinate system, strings exist along the x-axis, and catenae along the y-axis.
An understanding of the catena is established by distinguishing between the catena and other, similarly defined units. There are four units (including the catena) that are pertinent in this regard: string, catena, component, and constituent. The definition of the catena is repeated for easy comparison with the definitions of the other three units:
- Any element (word or morph) or any combination of elements that is continuous in the horizontal dimension (x-axis)
- Any element (word or morph) or any combination of elements that is continuous in the vertical dimension (y-axis)
- Any element (word or morph) or any combination of elements that is both a string and a catena
- Any component that is complete
A component is complete if it includes all the elements that its root node dominates. The string and catena complement each other in an obvious way, and the definition of the constituent is essentially the same as one finds in most theories of syntax, where a constituent is understood to consist of any node plus all the nodes that that node dominates. These definitions will now be illustrated with the help of the following dependency tree. The capital letters serve to abbreviate the words:
All of the distinct strings, catenae, components, and constituents in this tree are listed here:
- 21 distinct strings
- A, B, C, D, E, F, AB, BC, CD, DE, EF, ABC, BCD, CDE, DEF, ABCD, BCDE, CDEF, ABCDE,BCDEF, and ABCDEF
- 24 distinct catenae
- A, B, C, D, E, F, AB, BC, CF, DF, EF, ABC, BCF, CDF, CEF, DEF, ABCF, BCDF, BCEF, CDEF, ABCDF, ABCEF, BCDEF, and ABCDEF.
- 14 distinct components
- A, B, C, D, E, F, AB, BC, EF, ABC, DEF, CDEF, BCDEF, and ABCDEF
- 6 distinct constituents
- A, D, E, AB, DEF, ABCDEF
Noteworthy is the fact that the tree contains 39 distinct word combinations that are not catenae, e.g. AC, BD, CE, BCE, ADF, ABEF, ABDEF, etc. Observe as well that there are a mere six constituents, but 24 catenae. There are therefore four times more catenae in the tree than there are constituents. The inclusivity and flexibility of the catena unit becomes apparent. The following Venn diagram provides an overview of how the four units relate to each other:
While all four units are important, the discussion below focuses most directly on the catena.
Idiosyncratic language of all sorts can be captured in terms of catenae. When meaning is constructed in such a manner that does not allow one to acknowledge meaning chunks as constituents, the catena is involved. The meaning bearing units are catenae, not constituents. This situation is illustrated here in terms of various collocations and proper idioms.
Simple collocations (i.e. the co-occurrence of certain words) demonstrate well the catena concept. The idiosyncratic nature of particle verb collocations provide the first group of examples: take after, take in, take on, take over, take up, etc. In its purest form, the verb take means 'seize, grab, possess'. In these collocations with the various particles, however, the meaning of take shifts significantly each time depending on the particle. The particle and take convey a distinct meaning together, whereby this distinct meaning cannot be understood as a straightforward combination of the meaning of take alone and the meaning of the preposition alone. In such cases, one says that the meaning is non-compositional. Non-compositional meaning can be captured in terms of catenae. The word combinations that assume non-compositional meaning form catenae (but not constituents):
Both the a- and b-sentences show that while the verb and its particle do not form a constituent, they do form a catena each time. The contrast in word order across the sentences of each pair illustrates what is known as shifting. Shifting occurs to accommodate the relative weight of the constituents involved. Heavy constituents prefer to appear to the right of lighter sister constituents. The shifting does not change the fact that the verb and particle form a catena each time, even when they do not form a string.
Numerous verb-preposition combinations are idiosyncratic collocations insofar as the choice of preposition is strongly restricted by the verb, e.g. account for, count on, fill out, rely on, take after, wait for, etc. The meaning of many of these combinations is also non-compositional, as with the particle verbs. And also as with the particle verbs, the combinations form catenae (but not constituents) in simple declarative sentences:
The verb and the preposition that it demands form a single meaning-bearing unit, whereby this unit is a catena. These meaning-bearing units can thus be stored as catenae in the mental lexicon of speakers. As catenae, they are concrete units of syntax.
The final type of collocations produced here to illustrate catenae is the complex preposition, e.g. because of, due to, inside of, in spite of, out of, outside of, etc. The intonation pattern for these prepositions suggests that orthographic conventions are correct in writing them as two words (or more) words. This situation, however, might be viewed as a problem, since it is not clear that the two words each time can be viewed as forming a constituent. In this regard, they do of course qualify as a catena, e.g.
The collocations illustrated in this section have focused mainly on prepositions and particles and they are therefore just a small selection of meaning-bearing collocations. They are, however, quite suggestive. It seems likely that all meaning-bearing collocations are stored as catenae in the mental lexicon of language users.
Full idioms are the canonical cases of non-compositional meaning. The fixed words of idioms do not bear their productive meaning, e.g. take it on the chin. Someone who "takes it on the chin" does not actually experience any physical contact to their chin, which means that chin does not have its normal productive meaning and must hence be part of a greater collocation. This greater collocation is the idiom, which consists of five words in this case. While the idiom take it on the chin can be stored as a VP constituent (and is therefore not a problem for constituent-based theories), there are many idioms that clearly cannot be stored as constituents. These idioms are a problem for constituent-based theories precisely because they do not qualify as constituents. However, they do of course qualify as catenae. The discussion here focuses on these idioms since they illustrate particularly well the value of the catena concept.
Many idioms in English consist of a verb and a noun (and more), whereby the noun takes a possessor that co-indexed with the subject and will thus vary with subject. These idioms are stored as catenae but clearly not as constituents, e.g.
Similar idioms have a possessor that is freer insofar it is not necessarily co-indexed with the subject. These idioms are also stored as catenae (but not as constituents), e.g.
The following idioms include the verb, and object, and at least one preposition. It should again be obvious that the fixed words of the idioms can in no way be viewed as forming constituents:
The following idioms include the verb and the prepositional phrase at the same time that the object is free:
And the following idioms involving a ditransitive verb include the second object at the same time that the first object is free:
Certainly sayings are also idiomatic. When an adverb (or some other adjunct) appears in a saying, it is not part of the saying. Nevertheless, the words of the saying still form a catena:
Ellipsis mechanisms (gapping, stripping, VP-ellipsis, pseudogapping, answer fragments, sluicing, comparative deletion) are eliding catenae, whereby many of these catenae are non-constituents. The following examples illustrate gapping:
The a-clauses are acceptable instances of gapping; the gapped material corresponds to the catena in green. The b-clauses are failed attempts at gapping; they fail because the gapped material does not correspond to a catena. The following examples illustrate stripping. Many linguists see stripping as a particular manifestation of gapping where just a single remnant remains in the gapped/stripped clause:
The a-clauses are acceptable instances of stripping, in part because the stripped material corresponds to a catena (in green). The b-clauses again fail; they fail because the stripped material does not qualify as a catena. The following examples illustrate answer ellipsis:
In each of the acceptable answer fragments (a-e), the elided material corresponds to a catena. In contrast, the elided material corresponds to a non-catena in each of the unacceptable answer fragments (f-h).
- O'Grady (1998) introduced the catena concept as a basis for his analysis of the syntax of idioms. O'Grady called the relevant syntactic unit a "chain", however, not a "catena". The term catena was introduced later by Osborne et al. (2013) as a means of avoiding confusion with the preexisting chain concept of Minimalist theory.
- The catena concept has been developed beyond O'Grady's (1998) analysis of idioms. See the following articles: Osborne (2005), Osborne et al. (2011), Osborne (2012), Osborne and Groß (2012a), Osborne and Groß (2012b), and Osborne et al. (2012).
- O’Grady, W. 1998. The syntax of idioms. Natural Language and Linguistic Theory 16. 79-312.
- Osborne, T. 2005. Beyond the constituent: A DG analysis of chains. Folia Linguistica 39, 3-4. 251-297.
- Osborne, T. 2012. Edge features, catenae, and dependency-based Minimalism. Linguistic Analysis 34, 3-4, 321-366.
- Osborne, T., M. Putnam, and T. Groß. 2011. Bare phrase structure, label-less trees, and specifier-less syntax: Is Minimalism becoming a dependency grammar? The Linguistic Review 28: 315-364.
- Osborne, T. and T. Groß 2012a. Constructions are catenae: Construction Grammar meets Dependency Grammar. Cognitive Linguistics 23, 1, 163-214.
- Osborne, T. and T. Groß 2012b. Antecedent containment: A dependency grammar solution in terms of catenae. Studia Linguistica 66, 2, 94-127.
- Osborne, T., M. Putnam, and T. Groß 2012. Catenae: Introducing a novel unit of syntactic analysis. Syntax 15, 4, 354-396.