Definition of grammar:
1- Etymology : The word grammar is derived from Greek « grammatik? techn?» which means « art of letters »
Source: https://en.oxforddictionaries.com/definition/grammar
2- Terminology: The whole system and structure of a language or of languages in general, usually taken as consisting of syntax and morphology (including inflections) and sometimes also phonology and semantics.
Source: https://en.oxforddictionaries.com/definition/grammar
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