needless; dispensable; not required or uncalled-for

The quality or state of being necessary; the requirement for something to happen or exist.

essential condition; a necessary requirement; in logic or math, a condition that must be met for a result to follow, though its presence alone does not guarantee that result

the labor required for a worker to maintain their own and their family's livelihood, distinguished from [[剩余劳动|剩餘勞動|sheng4 yu2 lao2 dong4]]

in Marxist economics, the portion of a worker's output required to maintain their own subsistence and reproduce their labor power

to be necessary or required; to be obliged

not essential; unnecessary; not required