convention

A widely accepted or established social or professional practice; a formal meeting or assembly; an international agreement.

• conventional/kənˈvɛnʃənəl/(adj)传统的；按惯例的
• unconventional/ˌʌnkənˈvɛnʃənəl/(adj)不传统的

• social convention
• by convention
• break with convention
• industry convention
• Geneva Convention
• convention centre

1. 1.The report challenges the established convention that growth and environmental sustainability are incompatible goals.
2. 2.She broke with convention by presenting her findings before the formal panel review had been completed.

• custom/ˈkʌstəm/— an established practice
• norm/nɔːm/— standard behaviour
• practice/ˈpræktɪs/— a habitual way of doing

from Latin "conventio" = an agreement, meeting, from "convenire" (to come together)