obligation
🇺🇸
/ˌɑːblɪˈɡeɪʃn/
🇬🇧
/ˌɒblɪˈɡeɪʃn/
Something you must do because it is your duty or required by law.
You have an obligation to pay your taxes on time.
A promise or duty that you must fulfill.
My obligation is to help my family when they need me.