n.
Function: noun
Date: 15th century
1 : a cool time, place, or situation <the cool of the evening>
2 a : absence of excitement or emotional involvement : DETACHMENT <must surrender his fine cool and enter the closed crazy world of suicide ― Wilfrid Sheed> b : POISE , COMPOSURE <press questions ⋯ seemed to rattle him and he lost his cool ― New Republic >
3 : HIPNESS