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: necessary
Definition: absolutely essential
Antonyms: unnecessary, unneeded
Definition: not necessary
Antonyms: inessential, nonessential
Definition: anything that is not essential
Antonyms: unessential, inessential
Definition: not basic or fundamental
Antonyms: optional
Definition: possible but not necessary; left to personal choice
Antonyms: dispensable
Definition: capable of being dispensed with or done without
Main entry: necessary
Definition: unavoidably determined by prior circumstances
Usage: the necessary consequences of one's actions
Antonyms: evitable, avertable, avertible, avoidable
Definition: capable of being avoided or warded off