In etymology, doublets (alternatively etymological twins or twinlings) are words in a given language that share the same etymological root. Doublets are often the result of loanwords being borrowed from other languages. While doublets may be synonyms, the characterization is usually reserved for words that have diverged significantly in meaning: for example, the English doublets pyre and fire are distinct terms with related meanings that both ultimately descend from the Proto-Indo-European (PIE) word .
Words with similar meanings but subtle differences contribute to the richness of modern English, and many of these are doublets. A good example consists of the doublets frail and fragile. (These are both ultimately from the Latin adjective , but frail evolved naturally through its slowly changing forms in Old French and Middle English, whereas fragile is a learned borrowing directly from Latin in the 15th century.)
Another example of nearly synonymous doublets is aperture and overture (the commonality behind the meanings is "opening"). Doublets may also develop contrasting meanings, such as the terms host and guest, which come from the same PIE word and already existed as a doublet in Latin, and then Old French, before being borrowed into English. Doublets also vary with respect to how far their forms have diverged. For example, the connection between levy and levee is easy to guess, whereas the connection between sovereign and soprano is harder to guess.
Doublets can develop in various ways, according to which route the two forms took from the origin to their current form. Complex, multi-step paths are possible, though in many cases groups of terms follow the same path. Simple paths are discussed below, with the simplest distinction being that doublets in a given language can have their root in the same language (or an ancestor), or may originate in a separate language.
Most simply, a native word can at some point split into two distinct forms, staying within a single language, as with English too which split from to.
Alternatively, a word may be inherited from a parent language, and a cognate borrowed from a separate sister language. In other words, one route was direct inheritance, while the other route was inheritance followed by borrowing. In English this means one word inherited from a Germanic source, with, e.g., a Latinate cognate term borrowed from Latin or a Romance language. In English this is most common with words which can be traced back to Indo-European languages, which in many cases share the same proto-Indo-European root, such as Romance beef and Germanic cow. However, in some cases the branching is more recent, dating only to proto-Germanic, not to PIE; many words of Germanic origin occur in French and other Latinate languages, and hence in some cases were both inherited by English (from proto-Germanic) and borrowed from French or another source â see List of English Latinates of Germanic origin. The forward linguistic path also reflects cultural and historical transactions; often the name of an animal comes from Germanic while the name of its cooked meat comes from Romance. Since English is unusual in that it borrowed heavily from two distinct branches of the same language family tree â Germanic and Latinate/Romance â it has a relatively high number of this latter type of etymological twin. See list of Germanic and Latinate equivalents in English for further examples and discussion.
Less commonly, a native word may be borrowed into a foreign language, then reborrowed back into the original language, existing alongside the original term. An English example is animation and anime "Japanese animation", which was reborrowed from Japanese '. Such a word is sometimes called a ' (German for "one who wanders back").
In case of twins of foreign origin, which consist of two borrowings (of related terms), one can distinguish if the borrowing is of a term and a descendant, or of two cognate terms (siblings).
Etymological twins are often a result of chronologically separate borrowing from a source language. In the case of English, this usually means once from French during the Norman invasion, and again later, after the word had evolved separately in French. An example of this is warranty and guarantee.
Another possibility is borrowing from both a language and its daughter language. In English this is usually Latin and some other Romance language, particularly French â see Latin influence in English. The distinction between this and the previous is whether the source language has changed to a different language or not.
Less directly, a term may be borrowed both directly from a source language and indirectly via an intermediate language. In English this is most common in borrowings from Latin, and borrowings from French that are themselves from Latin; less commonly from Greek directly and through Latin.
In case of borrowing cognate terms, rather than descendants, most simply an existing doublet can be borrowed: two contemporary twin terms can be borrowed.
More remotely, cognate terms from different languages can be borrowed, such as sauce (Old French) and salsa (Spanish), both ultimately from Latin, or tea (Dutch ') and chai (Hindi), both ultimately from Chinese. This last pair reflects the history of how tea has entered English via different trade routes.
Many thousands of English examples can be found, grouped according to their earliest deducible Indo-European ancestor. In some cases over a hundred English words can be traced to a single root. Some examples in English include:
There are many more doublets from Greek, where one form is a vernacular borrowing and the other a learned borrowing, such as scandal and slander, both from ÃÂúìýôñûÿý.
Many words of French origin were borrowed twice or more. There were at least three periods of borrowing: one that occurred shortly after the Norman Conquest and came from Norman French, one in the thirteenth and fourteenth centuries from standard (Parisian) French at the time when English nobles were switching from French to English, and a third one during the sixteenth to nineteenth century, when France was at the height of its power and international influence. Examples of doublets from the first and second periods are catch vs. chase, cattle vs. chattel, and warden vs. guardian. More recent borrowings are often distinguished by maintaining the French spelling and pronunciation, e.g. chef (vs. chief), pâté (vs. paste), fête (vs. feast). There are multiple doublets caused by the w â g and ca â cha sound changes, which happened in standard French but not Norman French. Several of these examples also reflect changes that occurred after Old French which caused the possible environments of to be greatly reduced.
Derivative cognates are a classification of Chinese characters which have similar meanings and often the same etymological root, but which have diverged in pronunciation and meaning. An example is the doublet and . At one time they were pronounced similarly and meant "old (person)." ( in Standard Mandarin) has retained this meaning, but now mainly means "examine".
Differing literary and colloquial readings of certain Chinese characters are common doublets in many Chinese varieties, and the reading distinctions for certain phonetic features often typify a dialect group. For a given Chinese variety, colloquial readings typically reflect native vernacular phonology. Literary readings are used in some formal settings (recitation, some loanwords and names) and originate from other, typically more prestigious varieties. Sometimes literary and colloquial readings of the same character have different meanings. For example, in Cantonese, the character can have the colloquial pronunciation ("inexpensive"), and the literary pronunciation ("flat").
The words and (both meaning "part" or "portion") form an Irish doublet, both from the Proto-Celtic root . This root became in Gaulish , then was borrowed into Late Latin as , Anglo-Norman piece, then Middle English , before being borrowed into Middle Irish as , which became modern . In Old Irish, became , which in modern Irish is .
In Hindi and other New Indo-Aryan languages, members of native doublets are identified as either ' ('became that'), which is ultimately derived from Sanskrit but underwent changes through time, or ' ('same as that'), which is borrowed directly from literary Sanskrit. For example, Hindi 'tiger' is derived by historical stages () from Sanskrit 'tiger'. Meanwhile, Hindi has also directly borrowed () the Sanskrit word ', meaning 'tiger' in a more literary register.
Several doublets in Hindustani, which has two standard forms of Hindi and Urdu, come from common Proto-Indo-Iranian roots, with one descending via Sanskrit and another via Persian. These may have stayed synonyms or diverged into different meanings. One example where both patterns can be seen is from the Sanskrit vÃÂr (water) and Persian bârân (rain), both from Proto-Indo-Iranian wáHrÃÂ¥. The Hindustani words for rain include varṣàand barsÃÂt from Sanskrit as well as bÃÂrià  from Persian. Meanwhile, the word vará¹£ from the same root has come to mean year, though often the Persian word sÃÂl is used instead. This word is also a doublet, in this case of the Sanskrit word à Âarad, which has come to mean the season fall in Hindi.
Triplets:
As with many languages in Europe, a great deal of borrowing from written Latin â ' (Latinisms), or cultismos (learned words) â occurred during the Renaissance and the early modern era. Because Spanish is itself a Romance language already with many native words of Latin ancestry (transmitted orally, so with natural sound changes), the later written borrowing created a number of doublets. Adding to this was Spain's conquest by the Moors in the Middle Ages, leading to another vector for creating doublets (Latin to Arabic to Spanish).
Welsh contains many doublets of native origin, where a single Indo-European root has developed along different paths in the language. Examples of this are:
In addition to native doublets, Welsh has borrowed extensively over the centuries, particularly from Latin and English. This has led to many more doublets in the language, including many from Latin that entered Welsh via English borrowings. Examples include: