Main entry: necessary, necessity, essential, requirement, requisite
Definition: anything indispensable
Usage: 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
Antonyms: inessential, nonessential
Definition: anything that is not essential
Main entry: needed, needful, required, requisite
Definition: necessary for relief or supply
Usage: provided them with all things needful
Antonyms: unnecessary, unneeded
Definition: not necessary