Something customary is done according to practice. When a bride walks down the aisle, it's customary for everyone at the wedding to rise out of respect.

Every culture has its own customary traditions. In American culture it's customary for a child who loses a tooth to put it under her pillow and wait for the Tooth Fairy to arrive. In Greece, on the other hand, it's customary to throw a child's lost tooth onto the roof for good luck. Customary can also reference habitual things a person does, like taking your shoes off when you come home, or writing in your diary before bed.

Definitions of customary

adj commonly used or practiced; usual

“took his customary morning walk”
accustomed, habitual, wonted
occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure

adj in accordance with convention or custom

“sealed the deal with the customary handshake”
following accepted customs and proprieties

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