In phonology, absolute neutralisation is a phenomenon in which a segment of the underlying representation of a morpheme is not realized in any of its phonetic representation. For example, Chomsky & Halle (1968) assume that the underlying representation of the word ellipse contains a final segment /e/ even though this segment is never pronounced. But the assumption of this segment in underlying representation explains the exceptional stress pattern of the word, i.e. that of trisyllabic words instead of that of bisyllabic words, i.e. /ellípse/ instead of /éllipse/.