Permanent
late Middle English: from Latin permanent- ‘remaining to the end’ (perhaps via Old French), from per- ‘through’ + manere ‘remain’.
wiktionary
Used in English since 15th century, from Middle French permanent, from Latin permanens, from permanēo(“I stay through”).
etymonline
permanent (adj.)
"enduring, unchanging, unchanged, lasting or intended to last indefinitely," early 15c., from Old French permanent, parmanent (14c.) or directly from Latin permanentem (nominative permanens) "remaining," present participle of permanere "endure, hold out, continue, stay to the end," from per "through" (from PIE root *per- (1) "forward," hence "through") + manere "stay" (from PIE root *men- (3) "to remain").
Related: Permanently. As a noun meaning "permanent wave," by 1909. Of clothing, permanent press, in reference to a process designed to produce lasting creases in fabric," is attested from 1964.
