Noun
(programming) A function which calls all the other functions of a certain program; the only function that can be called independently.
(programming) A construct that performs a mapping between entities at compile time.
(linguistics) A group of grammatical systems that make meanings of a related kind.
Source: en.wiktionary.orgCoffin, C (ed.) English grammar in context, Book 3: Getting practical (2006), The Open University, pp. 22–23 Textual metafunction The textual metafunction relates to mode; the internal organisation and communicative nature of a text. Source: Internet
Ideational metafunction The ideational metafunction is the function for construing human experience. Source: Internet
The logical metafunction refers to the grammatical resources for building up grammatical units into complexes, for instance, for combining two or more clauses into a clause complex. Source: Internet