the state, condition (e.g. a law of nature, a (serious) need, a social rule etc) that makes a certain result unavoidable; something that one cannot be, live etc without
need, essentiality
Cases of word usage
1) to force, compel, (a person) to do something (by law, a necessity etc); to do something for (a person) as a favour or in answer to a request (oblige)
