anything indispensable; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained"
an act of aggression (as one against a person who resists); "he may accomplish by craft in the long run what he cannot do by force and violence in the short one"
a turbulent state resulting in injuries and destruction etc.