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absolutely essential

It is an important matter―a matter of importance―a matter of moment.

a written summary of essential points

an essential item

Primary specification

significant

important business

an indispensable implement

being of most importance

becoming important

to a crucial degree

of extreme importance

an important role

in great necessity

to be weighty and important

have as a necessary feature

a necessary thing

an important meaning

something that is fundamental

vitally important

play an important role

Basic things

a necessary or essential thing

view as important

the degree of indispensability

an important official

being indispensable

to be necessary

material needs

material needs