The honourable obligation that is the responsibility of those of high rank; in American English this often includes the expectation of benevolent actions such as helping those less fortunate.

(Christianity, chiefly Roman Catholicism) the obligation to attend a church service (mass) on Sundays; failing to fulfil this obligation without excuse constitutes a grave sin

(as response) Thank you.

(dated) Grateful.

(law) 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.

(law) A duty by which a party to an agreement is legally bound to pay the maturity of a debt at a time and in a manner as is stipulated within a given contract or promissory note.

(genetics) An individual who may be clinically unaffected but who must carry a gene mutation based on analysis of the family history; this usually applies to disorders inherited in an autosomal recessive and X-linked recessive manner.

(law) A branch of private law under civil-law legal systems concerning the rights and duties arising between individuals.

plural of obligate carrier

plural of moral obligation