Question

what does custom mean here?
the custom at many chinese weddings is for the bride to wear a qipao, a red silk dress with elaborate gold embroidery.
custom noun a practice that is traditional for a particular group
custom adjective made or changed to fit the needs of a particul person or role

Explanation:

In the sentence "The custom at many Chinese weddings is for the bride to wear a qipao...", "custom" is used as a noun. The context is about a traditional practice (the bride wearing a qipao) at Chinese weddings. The noun definition "a practice that is traditional for a particular group" fits this context as it refers to a traditional practice (wedding - related) of a particular group (Chinese people having weddings). The adjective definition about being made or changed for a particular person's needs does not fit here as the sentence is not describing something customized for an individual in a non - traditional sense but rather a traditional practice.

Answer:

The noun definition "a practice that is traditional for a particular group" is the correct meaning of "custom" in this context.