Meaning of non-diegetic in English:

non-diegetic

Pronunciation /ˌnɒndʌɪɪˈdʒɛtɪk/

adjective

  • (of sound in a film, television programme, etc.) having a source external to the context of the story, and not heard by the characters.

    • ‘the film is entirely dialogue-free, and virtually devoid of any non-diegetic sound’

Origin

1970s from non- + diegetic.