pos·te·ri·or·i·ty \(ˌ) ̷ ̷ˌ ̷ ̷ ̷ ̷ˈȯrəd.ē, -ˈär-\noun (-es) Etymology: Middle English posteriorite, from Medieval Latin posterioritas, from Latin posterior + -itas -ity 1.: the quality or state of being later or subsequent — opposed to priority 2.obsolete: inferiority