Doublearticulated

Doublearticulated, often written with a hyphen as double-articulated, describes a central property of human language and other sign systems: the existence of two distinct levels of structure that organize communication. In such systems, a finite set of basic units that carry little or no inherent meaning—phonemes in spoken languages or manual signs in sign languages—combine to form a large inventory of meaningful units (morphemes, words). Those meaningful units, in turn, are assembled from sequences of the first-level units, allowing a virtually unlimited repertoire of meanings to be encoded with a relatively small inventory of sounds or signs.

To illustrate, the morpheme 'un-' is realized by phonemes within many words; the word 'unhappiness' is built from three morphemes: 'un-' + 'happy' + '-ness', each realized through a sequence of phonemes. This two-level organization means languages can generate new words and meanings by rearranging or combining a limited set of sounds or signs and a finite set of meaningful units, enabling productive and flexible communication.

Historically, the concept is central to structural linguistics and semiotics. It is closely associated with Louis Hjelmslev and his idea of language as existing on two planes—expression and content—each divisible into smaller functional units that together realize meaning. In contemporary linguistics, the notion of double articulation remains a foundational description of how many languages are organized, and it is recognized in analyses of both spoken and signed languages.