in·su·lar·i·ty \ˌ ̷ ̷ ̷ ̷ˈlarəd.ē, -ətē, -i also -ˈler-\noun (-es) 1.: the quality or state of being an island or consisting of islands < the insularity of Great Britain > 2. a.: condition of dwelling on an island or in isolation b.: narrowness or illiberality of opinion or custom