consuetude
noun
con·sue·tude ˈkän(t)-swi-ˌtüd 
kən-ˈsü-ə-,
-ˌtyüd
: social usage : custom
consuetudinary
ˌkän(t)-swi-ˈtü-də-ˌner-ē
adjective kən-ˌsü-ə-
-ˈtyü-
Word History
Etymology
Middle English, from Latin consuetudo — more at custom
First Known Use
14th century, in the meaning defined above