duty

• "we must instill a sense of duty in our children"
• "every right implies a responsibility"
• "every opportunity, an obligation"
• "every possession, a duty- John D.Rockefeller Jr"

Synonyms

• responsibilitythe social force that binds you to the courses of action demanded by that force; the proper sphere or extent of your activities; a form of trustworthiness
• obligationthe social force that binds you to the courses of action demanded by that force; the state of being obligated to do or pay something; a personal relation in which one is indebted for a service or favor ; a written promise to repay a debt ; a legal agreement specifying a payment or action and the penalty for failure to comply

• "the duties of the job"

• "they signed a treaty to lower duties on trade between their countries"

Synonyms

• tariffcharge a tariff; a government tax on imports or exports