consuetude a custom or usage that has acquired the force of law
couvade a custom among some peoples whereby the husband of a pregnant wife is put to bed at the time of bearing the child
germanism a custom that is peculiar to Germany or its citizens
habit,
use (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition; "owls have nocturnal habits"; "she had a habit twirling the ends of her hair"; "long use had hardened him to it"
hijab the custom in some Islamic societies of women dressing modestly outside the home; "she observes the hijab and does not wear tight clothing"
practice a customary way of operation or behavior; "it is their practice to give annual raises"; "they changed their dietary pattern"
wont,
habit (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition; "owls have nocturnal habits"; "she had a habit twirling the ends of her hair"; "long use had hardened him to it"
hadith (Islam) a tradition based on reports of the sayings and activities of Muhammad and his companions
custom -
habitual patronage; "I have given this tailor my custom for many years"