consuetude

noun consuetude

• usance — Commerce. a length of time, exclusive of days of grace and varying in different places, allowed by custom or usage for the payment of foreign bills of exchange.
• habit — an acquired behavior pattern regularly followed until it has become almost involuntary: the habit of looking both ways before crossing the street.
• practice — habitual or customary performance; operation: office practice.
• familiarity — thorough knowledge or mastery of a thing, subject, etc.
• manner — mainour.