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1. The continuing, time-dependent part of strain resulting from stress; the permanent and continuing dimensional deformation of a material under a sustained load, following the initial instantaneous elastic deformation.
2. Slow movement of rock debris or soil, usually imperceptible except in observations of long duration.
3. In structures, particularly of concrete, permanent deflection of structural framing or structural decking resulting from plastic flow under continued stress.
4. In roofing, permanent elongation or shrinkage of a roofing membrane resulting from thermal or moisture changes.
5. The flow of water along the interface between a structure and the surrounding soil or rock foundation.