Derivation and Definitions
The word phonology comes from Greek φωνή, phōnḗ, "voice, sound", and the suffix -logy (which is from Greek λόγος, lógos, "word, speech, subject of discussion").
Definitions of the term vary. Nikolai Trubetzkoy in Grundzüge der Phonologie (1939) defines phonology as "the study of sound pertaining to the system of language", as opposed to phonetics, which is "the study of sound pertaining to the act of speech" (the distinction between language and speech being basically Saussure's distinction between langue and parole). More recently, Lass (1998) writes that phonology refers broadly to the subdiscipline of linguistics concerned with the sounds of language, while in more narrow terms, "phonology proper is concerned with the function, behaviour and organization of sounds as linguistic items". According to Clark et al. (2007) it means the systematic use of sound to encode meaning in any spoken human language, or the field of linguistics studying this use.
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