ten·e·bros·i·ty \ˌ ̷ ̷ ̷ ̷ˈbräsəd.ē, -sətē, -i\noun (-es) Etymology: Medieval Latin tenebrositat-, tenebrositas, from Latin tenebrosus dark + -itat-, -itas ity : darkness < switches off the light, calls for the first slide, and talks for three quarters of an hour in Stygian tenebrosity — Lancet >