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Compound (linguistics)

Lexeme (word or sign) that consists of more than one stem

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The meaning of the compound may be similar to or different from the meaning of its components in isolation. The component stems of a compound may be of the same part of speech—as in the case of the English word footpath, composed of the two nouns foot and path—or they may belong to different parts of speech, as in the case of the English word blackbird, composed of the adjective black and the noun bird. With very few exceptions, English compound words are stressed on their first component stem.

Some languages easily form compounds from what in other languages would be a multi-word expression. This can result in unusually long words, a phenomenon known in German (which is one such language) as Bandwurmwörter ("tapeworm words").

Compounding extends to Sign languages as well, where compounds are also created by combining two or more sign stems.

So-called "classical compounds" are compounds derived from classical Latin or ancient Greek roots.

In many languages, including English, Spanish, Latin and German, all numbers greater than twenty that have more than one non-zero digit are written and spoken as compounds.

Formation of compounds

Compound formation rules vary widely across language types.

In a synthetic language, the relationship between the elements of a compound may be marked with a case or other morpheme. For example, the German compound Kapitänspatent consists of the lexemes Kapitän (sea captain) and Patent (license) joined by an -s- (originally a genitive case suffix); and similarly, the Latin lexeme paterfamilias contains the archaic genitive form familias of the lexeme familia (family); in the English word daisy, the saxon genitive (equivalent to -'s) was etymologically fossilized from the Old English compound dæġes ēage (literally, "day's eye"). Conversely, in the Hebrew language compound, the word בֵּית סֵפֶר bet sefer (school), it is the head that is modified: the compound literally means "house-of book", with בַּיִת bayit (house) having entered the construct state to become בֵּית bet (house-of). This latter pattern is common throughout the Semitic languages, though in some it is combined with an explicit genitive case, so that both parts of the compound are marked, e.g.

Arabicعبد الله

ʕabd-u

servant-NOM

l-lāh-i

DEF-god-GEN

"servant of-the-god: the servant of God"

Agglutinative languages tend to create very long words with derivational morphemes. Compounds may or may not require the use of derivational morphemes also.

In German, extremely extendable compound words can be found in many different domains. In the language of chemistry, for example, compounds can be practically unlimited in length, mostly because the German rule suggests combining all noun adjuncts with the noun as the last stem. German examples include Farb­fernsehgerät (color television set), Funk­fernbedienung (radio remote control), and the often quoted jocular word Donau­dampfschifffahrts­gesellschafts­kapitänsmütze (originally only two Fs, Danube-Steamboat-Shipping Company captain['s] hat), which can of course be made even longer and even more absurd, e.g. Donau­dampfschifffahrts­gesellschafts­kapitänsmützen­reinigungs­ausschreibungs­verordnungs­diskussionsanfang ("beginning of the discussion of a regulation on tendering of Danube steamboat shipping company captain hats") etc. According to several editions of the Guinness Book of World Records, the longest published German word has 79 letters and is Donau­dampfschiffahrts­elektrizitäten­hauptbetriebswerkbau­unterbeamten­gesellschaft ("Association for Subordinate Officials of the Main Electric[ity] Maintenance Building of the Danube Steam Shipping"), but there is no evidence that this association ever actually existed.

In Finnish, although there is theoretically no limit to the length of compound words, words consisting of more than three components are rare. Internet folklore sometimes suggests that lentokone­suihkuturbiinimoottori­apumekaanikko­aliupseerioppilas (airplane jet turbine engine auxiliary mechanic non-commissioned officer student) is the longest word in Finnish, but evidence of its actual use is scant and anecdotal at best.

Compounds can be rather long when translating technical documents from English to some other language, since the lengths of the words are theoretically unlimited, especially in chemical terminology. For example, when translating an English technical document to Swedish, the term "Motion estimation search range settings" can be directly translated to rörelse­uppskattnings­sökintervalls­inställningar, though in reality, the word would most likely be divided in two: sökintervalls­inställningar för rörelse­uppskattning – "search range settings for motion estimation".

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