In historical linguistics, a linkage is a network of related dialects or languages that formed from a gradual diffusion and differentiation of a proto-language.[1]

The term was launched by Malcolm Ross in his study of Western Oceanic languages (Ross 1988). It’s contrasted with a household, which arises when the proto-language speech community separates into groups that stay remoted from each other and don’t form a community.[2]

Principle
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Linkages are formed when languages emerged traditionally from the diversification of an earlier dialect continuum. Its members may have diverged regardless of sharing subsequent innovations, or such dialects could have come into contact and so converged. [a] In any dialect continuum, improvements are shared between neighbouring dialects in intersecting patterns. The patterns of intersecting improvements proceed to be evident because the dialect continuum turns into a linkage.

In line with the comparative methodology, a gaggle of languages that solely shares a set of innovations constitutes a “(genealogical) subgroup”. A linkage is thus normally characterised by the presence of intersecting subgroups. [3] The tree mannequin doesn’t permit for the existence of intersecting subgroups and so is ill-suited to signify linkages, that are higher approached utilizing the wave model. [4][5][6]

The cladistic strategy underlying the tree model requires the frequent ancestor of every subgroup to be discontiguous from different related languages and unable to share any innovation with them after their “separation”. As for the language descended from dialect D, it’ll belong concurrently to three “intersecting subgroups” (BCD, CDE and DEF). [6] Insofar as each set of dialects was mutually intelligible at the time of the improvements, all will be seen as forming separate languages. Amongst them, Proto-BCD will be the language ancestral to the subgroup BCD, Proto-CDE the language ancestral to CDE and so on. François’s strategy to linkages. That assumption is absent from Ross. Their genealogical subgroups even have languages descended from a typical ancestor, as outlined by a set of completely-shared innovations), however whose widespread ancestor might not have been discretely separated from its neighbours. For example, a sequence of dialects A B C D E F could bear a number of linguistic improvements, some affecting BCD, others CDE, nonetheless others DEF.

In both the tree and the linkage approaches, genealogical subgroups are strictly defined by their shared inheritance from a common ancestor. François also claims that a tree can be thought of a special case of a linkage during which all subgroups happen to be nested and temporally ordered from broadest to narrowest. Simply, though trees entail that each one proto-languages must be discretely separated, the linkage model avoids that assumption. [3]

With the intention to unravel the genealogical construction of linkages, Kalyan and François have designed a dedicated quantitative technique, named Historical glottometry.[5][7]

Examples
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An instance of a linkage is the one formed by the Central Malayo-Polynesian languages of the Banda Sea (a sea in the South Moluccas in Indonesia). [8] The Central-Japanese Malayo-Polynesian languages are commonly divided into two branches, Central Malayo-Polynesian and Japanese Malayo-Polynesian, every having certain defining options that unify them and distinguish them from the opposite. Nevertheless, whereas Proto-Jap and Proto-Central-Jap Malayo-Polynesian could be reconstructed (the sibling and the dad or mum of Central Malayo-Polynesian, respectively), a Proto-Central Malayo-Polynesian language reconstruction, distinct from Proto-Central-Eastern Malayo-Polynesian doesn’t seem possible.

It may be that the branches of Central Malayo-Polynesian are every as outdated as Eastern Malayo-Polynesian but that they went on to change options that are actually considered to define them as a household. The features widespread to Jap Malayo-Polynesian might be assumed to have been current in a single ancestral language, however that’s not the case for Central Malayo-Polynesian.

This state of affairs doesn’t quantity to a denial of a standard ancestry of the Central Malayo-Polynesian languages. It is just a reinterpretation of the age of the connection to be just as old as their relationship to Japanese Malayo-Polynesian.

François (2014, p. 171) suggests that a lot of the world’s language households are really linkages that are made up of intersecting, not nested, subgroups. He cites the Oceanic languages of northern Vanuatu in addition to these of Fiji and of Polynesia and a minimum of some sections of the Pama-Nyungan, Athabaskan, Semitic, Sinitic, and Indo-European households.[which?]

Within Indo-European, Indo-Aryan, Western Romance and Germanic, in turn, type linkages of their very own.[citation wanted]

Areal function

Historical glottometry

Language contact

Notes
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^ Ross’s concept of a linkage differs from R. M. W. Dixon, who posits that over long durations, unrelated languages in touch could converge until they appear to be related (this idea is closer to what’s in any other case known as a Sprachbund or areal features).

^ “I take advantage of the term linkage to refer to a bunch of communalects [i.e. dialects or languages] which have arisen by dialect differentiation” (Ross 1988, p. 8).

^ “I exploit the term household to refer to a bunch of communalects which have diversified from a single language by separation, slightly than by dialect differentiation” (Ross 1988, p. 8).

^ a b See François (2014:171-172).

^ See Heggarty, Maguire & McMahon (2010).

^ a b François (2014)

^ a b See Lynch, Ross & Crowley (2002):92-93).

^ Kalyan & François (2018).

^ “Banda Sea”. Encyclopædia Britannica Online. Encyclopædia Britannica Inc. Retrieved 2007-01-15.

Sources
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François, Alexandre (2014), “Timber, Waves and Linkages: Models of Language Diversification” (PDF), in Bowern, Claire; Evans, Bethwyn (eds.), The Routledge Handbook of Historic Linguistics, London: Routledge, pp. 161-189, ISBN 978-0-41552-789-7, archived from the original on 27 February 2025, retrieved 31 October 2025citation: CS1 maint: bot: unique URL standing unknown (hyperlink).

Heggarty, Paul; Maguire, Warren; McMahon, April (2010). “Splits or waves? Timber or webs? How divergence measures and network evaluation can unravel language histories”. Philosophical Transactions of the Royal Society B. 365 (1559): 3829-3843. doi:10.1098/rstb.2010.0099. PMC 2981917. PMID 21041208.

Kalyan, Siva; François, Alexandre (2018), “Freeing the Comparative Methodology from the tree mannequin: A framework for Historical Glottometry” (PDF), in Kikusawa, Ritsuko; Reid, Laurie (eds.), Let’s Speak about Bushes: Genetic relationships of languages and their phylogenic illustration, Senri Ethnological Studies, 98, Ōsaka: National Museum of Ethnology, pp. 59-89.

Lynch, John; Malcolm Ross; Terry Crowley (2002). The Oceanic languages. Richmond, Surrey: Curzon. ISBN 978-0-7007-1128-4. OCLC 48929366.

Ross, Malcolm D. (1988). Proto Oceanic and the Austronesian languages of Western Melanesia. Canberra: Pacific Linguistics.

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Linkage (linguistics)