tolerance

Tolerance comes from Middle English toleraunce, borrowed from Old French tolerance, which traces to Latin tolerantia, meaning "endurance." That Latin noun grew out of tolerāns, the present participle of tolerō, "to endure."

The word has carried the sense of enduring or bearing up under something since its Latin root, passing that meaning through Old French and Middle English largely intact.

It shares its root with tolerō, the Latin verb "to endure," which also gave English words built on the idea of bearing or withstanding.