Essential Meaning of necessary
1 : so important that you must do it or have it : absolutely needed Is it really/absolutely necessary for me to have surgery? The threat of a thunderstorm made it necessary to cancel the picnic. See More ExamplesIt's not necessary to wear a tie. Food is necessary for life. We had all the necessary ingredients. Apply another coat of paint if necessary. [=if it is needed] Take as much time as necessary. [=as much time as you need] She took the medicine only when absolutely necessary. a medically necessary procedure
2 formal : unable to be changed or avoided Higher prices are a necessary consequence of the company's new services. There is no necessary connection between what is legal and what is moral. [=what is legal does not always have to be moral and what is moral does not always have to be legal]
Full Definition of necessary
(Entry 1 of 2)
1 : absolutely needed : required Food is necessary for life.
b(1) : logically unavoidable a necessary conclusion
(2) : that cannot be denied without contradiction
c : determined or produced by the previous condition of things the necessary outcome of the affair
d : compulsory Taking the oath of obedience is necessary.
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