Definition of metatextual in English:
metatextual
adjective ˌmɛtəˈtɛkstʃʊəlˌmɛtəˈtɛkstjʊəlˌmɛtəˈtɛkstʃ(ʊ)l
Relating to or characteristic of a meta-text; standing outside a text.
Origin
1970s; earliest use found in Journal of Philosophy. From meta- + textual, after meta-text.