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In some models of phonology as well as morphophonology in the field of linguistics, the underlying representation (UR) or underlying form (UF) of a word or morpheme is the abstract form that a word or morpheme is postulated to have before any phonological rules have been applied to it.[1][2] In contrast, a surface representation is the phonetic representation of the word or sound. The concept of an underlying representation is central to generative grammar.[3]
If more phonological rules apply to the same underlying form, they can apply wholly independently of each other or in a feeding or counterbleeding order. The underlying representation of a morpheme is considered to be invariable across related forms (except in cases of suppletion), despite alternations among various allophones on the surface.
^Bromberger, Sylvain; Morris Halle (2006). "Phonology". In Donald M. Borchert (ed.). Encyclopedia of Philosophy (2nd ed.). Detroit: Macmillan Reference USA. pp. 551–553.
^O'Grady, William; John Archibald (2005). Contemporary Linguistics. Boston: Bedord/St. Martin's. p. 92.
^Crystal, David (2009). "underlying (adj.)". Dictionary of Linguistics and Phonetics. Hoboken: Wiley. p. 501.
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of representation: underlyingrepresentation and surface phonetic representation. Ordered phonological rules govern how underlyingrepresentation is transformed...
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theoretical physics, a representation of a Lie group is a linear action of a Lie group on a vector space. Equivalently, a representation is a smooth homomorphism...
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