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1. The government department responsible for collecting tariffs and for controlling the flow of goods into and out of a country
    
2. Money collected under a tariff
   - customs duty, custom, impost
    
3. A customs office or checkpoint

1. Accepted or habitual practice
   - usage, usance [archaic]
    
2. A specific practice of long standing
   - tradition
    
3. Habitual patronage
   "I have given this tailor my custom for many years"

Type of: duty, patronage, pattern, practice, survival, tariff, trade

Encyclopedia: Customs, immigration and quarantine