necessary; needed; essential; necessity; need; requirement
unnecessary; not needed; not necessary
to need; to call for; to require
inevitable; necessary; certain; inevitability; necessity
absolutely essential; indispensable; vital; critical
bare minimum; minimum necessary (amount, number, etc.)
necessities; necessary article; requisite; essentials
necessary condition; requirement
daily (living) necessities; necessities; essentials for life
necessary information; required fields (e.g. in a form)
sure punishment or reward
necessary documents; important documents
must-read; required reading
conscious neglect; willful negligence; wilful negligence
inevitability of punishment
necessity is the mother of invention
all living things must die
must-read (book); required reading
necessary and sufficient condition
(socially) necessary labour; necessary work
as necessary (needed); if necessary (needed)
necessary labour time (in Marxian economics)
socially necessary labour time
(minimum) system requirements
indispensable; essential; necessary; must-have