work that you are obliged to perform for moral or legal reasons; "the duties of the job"
the social force that binds you to the courses of action demanded by that force; "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
a government tax on imports or exports; "they signed a treaty to lower duties on trade between their countries"
ask (for something); "He applied for a leave of absence"; "She applied for college"; "apply for a job"
refer (a word or name) to a person or thing; "He applied this racial slur to me!"
apply oneself to; "Please apply yourself to your homework"
be pertinent or relevant or applicable; "The same laws apply to you!"; "This theory holds for all irrational numbers"; "The same rules go for everyone"