customary

Etymology

From Middle English custumary, from Medieval Latin custumarius. By surface analysis, custom + -ary.

adj

1. In accordance with, or established by, custom or common usage
   When two people met for the first time in Diaspar—or even for the hundredth—it was customary to spend an hour or so in an exchange or courtesies before getting down to business, if any. 1956, Arthur C. Clarke, The City and the Stars, page 39
2. Holding or held by custom
   customary tenants
   The tenants are chiefly customary and heriotable. 1777, Joseph Nicolson, Richard Burn, The history and antiquities of the counties of Westmorland and Cumberland

noun

1. (law) A book containing laws and usages, or customs; a custumal.