In Common usage:
Necessity is a noun which means 'a thing that is needed'. Necessary is an adjective which means 'needed'. Thus, "necessity" means "necessary thing".
In Philosophy:
"Necessary" is an adjective meaning "cannot be otherwise" (as opposed to "Contingent" which means "can possibly be otherwise"). "Necessity" is a noun meaning "something which cannot be otherwise".
your head
An elecomic luxury is wasting land on pools huge garden,etc.And an economic necessity is when you need a certain amount of space (houses)to make something totally necessary (to live in)
There is no adjective form of the noun 'necessity'.A related adjective is necessary.
The adjective form of necessity is necessary.
Without necessity there can be no creativity! Man only creates when it is necessary. Philosophy is necessary for man to live civil!
necessity love is true love that is necessary and very strong.
necessity
They mean the same thing.
Need means that you would be better off if you get it. Neccessity means that you should have it (to function properly)?
the public sector necessity
Necessary is an adjective (needed, required).There are related nouns: need and necessity.
Mandatory means you have to do it, no questions asked. Necessary means its good to do it but you don't have to but they recommend it.