英和和英

have need of

do the necessary

to be necessary

of something, to be needed

according to the need

clamant needs

by necessity

Is required

a necessary thing

in case of necessity

It's necessary.

demand and supply

It is necessary.

meet a need

at [in case of] need

urgently needed

to meet a need―meet a want

to meet a need

to cause necessity―necessitate

need the spur

as much as necessary

the degree of necessity

a required subject

You will be required to do so.

something that is indispensable

revision required

to be pressed by necessity

more than is needed

the degree of indispensability

immediate needs