Permanent

adj. lasting, enduring, perpetual; regular; fixed, invariable

n. chemical process for permanently curling hair

In linear algebra, the permanent of an n-by-n matrix A = (ai,j) is defined as The sum here extends over all elements σ of the  symmetric group Sn, i.e. over all permutations of the numbers 1, 2, ..., n.For example,
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Noun
1. a series of waves in the hair made by applying heat and chemicals
(synonym) permanent wave, perm
(hypernym) wave
Adjective
1. continuing or enduring without marked change in status or condition or place; "permanent secretary to the president"; "permanent address"; "literature of permanent value"
(synonym) lasting
(antonym) impermanent, temporary
(similar) abiding, enduring, imperishable
(see-also) ineradicable
(attribute) permanence, permanency
2. not capable of being reversed or returned to the original condition; "permanent brain damage"
(similar) irreversible

adv. permanently, regularly; constantly; perpetually

adj. permanent, lasting, enduring, perpetual, standing, constant

adj. permanent, continuous, standing

n. permanent, worker on the payroll