necessary
1. [ adjective ] absolutely essential
Related terms: unnecessary needed essential obligatory essential indispensable obligatory necessity
2. [ adjective ] unavoidably determined by prior circumstances
Examples:

"the necessary consequences of one's actions"

Related terms: inevitable
3. [ noun ] Last name, frequency rank in the U.S. is 26227
4. [ noun ] anything indispensable
Synonyms: requirement necessity essential requisite
Examples:

"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"

Related terms: inessential entity thing need must desideratum want
Similar spelling:   necessarily