oscuridad
/oskuɾiˈdad/ · A2 · noun · f
dark
🌑 oscuridad = oscuro (dark) + -idad (-ity): obscurity, literally dark-ness
From Latin obscuritas, the same root as English obscurity. Spanish dropped the b (obscuro became oscuro) and the ending -idad matches English -ity, as in ciudad/city or realidad/reality. Nouns in -idad are always feminine: la oscuridad.