permanent

The limestone mountains soak up the rain, so there are no permanent streams.

Over time, small-scale attacks on vulnerable coastal communities evolved into sieges on cities; temporary camps grew into permanent communities; and trade networks spread even farther.

I'm preparing to take my Norskproven, which is the Norwegian language test and social studies test, so that I can become a permanent resident.

Like, to study turtle populations with the mark and recapture method, an ecologist might put a small notch in their shells, or for butterflies, label the wing with a permanent marker.