permanent

adj

1. Without end, eternal.

   “Nothing in this world is truly permanent.”

   “Things that had been permanent and unquestionable were suddenly thrown into doubt.”

2. Lasting for an indefinitely long time.

   “The countries are now locked in a permanent state of conflict.”

noun

1. A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm.

   “She had pewter-coloured hair set in a ruthless permanent, a hard beak and large moist eyes with the sympathetic expression of wet stones.”

2. Given an n×n matrix a_ij,, the sum over all permutations π, of ∏ᵢ₌₁ⁿa_iπ(i).
3. A card whose effects persist beyond the turn on which it is played.

verb

1. (dated, transitive)To perm (the hair).