Origin: Latin suffix -tion
Moral obligation has 2 different meanings across 1 category:
an obligation arising out of considerations of right and wrong
"he did it out of a feeling of moral obligation"
A duty which one owes and ought to perform on the basis of considerations of right and wrong, but which he is not legally bound to fulfill, as a duty to be charitable, a duty to pay a debt barred by the act of limitations, etc.