Duty

noun

1. That which one is morally or legally obligated to do.

   "We don't have a duty to keep you here."

2. The state of being at work and responsible for or doing a particular task.

   "I’m on duty from 6 pm to 6 am."

3. A tax placed on imports or exports; a tariff.
4. One's due, something one is owed; a debt or fee.
5. Respect; reverence; regard; act of respect; homage.