/ ˈnesəsəri; NAmE -seri/ adjective
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.
[ only before noun ] that must exist or happen and cannot be avoided
SYN inevitable :
This is a necessary consequence of progress.
- a necessary evil
late Middle English : from Latin necessarius , from necesse be needful.