Webster's Revised Unabridged Dictionary · 1913

Permanent

Permanent , adjective

[Latin permanens, -entis, present participle of permanere to stay or remain to the end, to last; per + manere to remain: compare French permanent. See Per-, and Mansion.]

Continuing in the same state, or without any change that destroys form or character; remaining unaltered or unremoved; abiding; durable; fixed; stable; lasting; as, a permanent impression.
Eternity stands permanent and fixed. — Dryden
Collocations (3)
Permanent gases (Chemistry & Physics) , hydrogen, oxygen, nitrogen, and carbon monoxide; -- also called incondensible gases or incoercible gases, before their liquefaction in 1877. The term is now archaic.
Permanent way , the roadbed and superstructure of a finished railway; -- so called in distinction from the contractor's temporary way.
Permanent white (Chemistry) , barium sulphate (heavy spar), used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide.

permanent , noun

1.
A wave or curl in the hair that lasts for months and is made durable by treating the hair with chemicals when it is curled.