obligation -
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
note of hand,
promissory note,
note a characteristic emotional quality; "it ended on a sour note"; "there was a note of gaiety in her manner"; "he detected a note of sarcasm"
floater an insurance policy covering loss of movable property (e.g. jewelry) regardless of its location
An obligation is a requirement to take some course of action, whether legal or moral. There are also obligations in other normative contexts, such as obligations of etiquette, social obligations, and possibly in terms of politics, where obligations are requirements which must be fulfilled. These are generally legal obligations, which can incur a penalty for unfulfilment, although certain people are obliged to carry out certain actions for other reasons as well, whether as a tradition or for social reasons.
OmegaWiki Dictionary
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obligation Juridical liability based on which a person, called debitor, must carry out a service of economical value for another person, called creditor.