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Definition permanent

Etymology

Used in English since 15th century, from Middle French permanent, from Latin permanens, from perman?o (�I stay through�).

Adjective

permanent (comparative more permanent, superlative most permanent)

1. Without end, eternal.
2. Lasting for an indefinitely long time.

Noun

permanent (plural permanents)

1. A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm.
2. (linear algebra, combinatorics) Given an ${\displaystyle n\times n}$ matrix ${\displaystyle a_{ij}\,}$, the sum over all permutations ${\displaystyle \pi \,}$ of ${\displaystyle \prod _{i=1}^{n}{a_{i\pi (i)}}}$.