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English definition of “necessary”

necessary

adjective    /ˈnes·əˌser·i/
needed in order to achieve a particular result: Don’t take any more luggage than is strictly necessary. He lacks the necessary skills for the job. If necessary, we can always change the date of our trip. necessary evil A necessary evil is something unpleasant that must be accepted in order to achieve a particular result: Most Americans accept taxes as a necessary evil. Necessary can be used in negatives and questions to show that you disapprove of something and do not think it should be done: [+ to infinitive] Was it really necessary to say that?
(Definition of necessary adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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