/ ˈnesəsəri; NAmE -seri/ adjective
1.
necessary (for sb/sth) (to do sth) that is needed for a purpose or a reason
SYN essential :
It may be necessary to buy a new one.
It doesn't seem necessary for us to meet.
Only use your car when absolutely necessary.
If necessary , you can contact me at home.
I'll make the necessary arrangements.
2.
[ only before noun ] that must exist or happen and cannot be avoided
SYN inevitable :
This is a necessary consequence of progress.
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IDIOMS
- a necessary evil
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WORD ORIGIN
late Middle English : from Latin necessarius , from necesse be needful.