In formal linguistics, the term ʻsyntaxʼ is used to replace ʻgrammarʼ; this usage comes from the philosophy of language, where syntax is opposed to semantics (this is the context in which ʻpragmaticsʼ may come in as a third term). In the terminology of linguistics, syntax is just one part of grammar: grammar consists of syntax and vocabulary, plus [...] also morphology [...] There is another reason for not using the term ʻsyntaxʼ. This word suggests proceeding in a particular direction, such that a language is interpreted as a system of forms, to which meanings are then attached.
- Halliday (1985), Pag. XIV