darkness
The auditorium was plunged into darkness, bringing the music to an abrupt halt.
Freddie switched off the headlights and plunged them into darkness.
There was a sudden terrifying sound and the cabin was plunged abruptly into darkness.

SMART Vocabulary: related words and phrases

Darkness & becoming dark
blackness
darken
darkened
darkness
dim
dimly
dimness
dingily
dingy
inky
pitch darkness
pitchy
semi-darkness
shade
shaded
shadily
shadow
silhouette
silhouetted
twilight