The Notion of Semantically-structural Equivalencein the Ancient Arabic Grammar

This study handles, from the descriptive perspective, one of the main issues correlates syntax to meaning, which is the notion of semantically-structural Equivalence in Ancient Arabic Grammar. The study is devoted to tackle the notion and term of equivalence in the ancient Arab grammarian sights, throughout reviewing the different structural types that indicate similar meaning into their grammatical works.The study demonstrates that the notion of semantically-structural Equivalence was clearly understood by Old Arab grammarians, despite they used various terms to refer to the same notion. It reveals also that the old Arab grammarians applied the notion viaanalyzing different structural types, such as predicative constructions, non-predicative constructions and predicative phrases. Furthermore, the study emphasizes the influence of context on identifying equivalent sentences and the necessity of making benefit from modern syntactic insights, mainly functional grammar theory, to verify the current study issue