definition of
necessary

[1] #1 necessary s. unavoidably determined by prior circumstances; "the necessary consequences of one's actions". wn

[2] #2 necessary n. [necessity, essential, requirement, requisite] 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". wn