Customary
来自Big Physics
late Middle English (as a noun): from medieval Latin custumarius, from custuma, from Anglo-Norman French custume (see custom).
etymonline
customary (adj.)
1520s, "liable to customs or dues;" c. 1600, "according to established usage, habitual," from Medieval Latin custumarius, from Latin consuetudinarius, from consuetitudinem (see custom (n.)). In Middle English it was a noun, "written collection of customs" of a manor or community. Earlier words for "according to established usage" were custumal (c. 1400, from Old French), custumable (c. 1300). Related: Customarily.
