The term ellipsis, broadly construed, applies to syntactic structures that seem to host obligatory positions not filled with overt lexical materiaL More narrowly construed, the term refers to a hypothetical grammatical process that deprives lexical material of its phonetic content. So, ellipsis is a grammatical omission in contrast to other kinds of omission such as phonological, morphological, or semantic (Quirk, 1985: 883). Ellipsis can be distinguished by its recoverable nature, which means the insertion of grammatical elements results in a grammatical sentence (ibid., 885).
Mohammad Al-Khawalda