Definitions:

1. Often used to describe a dimly lit environment. NOUN
   • As the sun set, the forest was enveloped in a soft semidarkness, making it difficult to see clearly.
2. Refers to a state of partial or incomplete darkness, where there is some light, but not enough to fully illuminate the surroundings. NOUN
   • The room was filled with semidarkness, illuminated only by the faint glow of a distant streetlamp.

Synonyms:

• dusk
• half-light
• twilight