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Strain may refer to:
A genetic variant or subtype within a species, commonly used for bacteria and viruses.
The deformation per unit length/material response in mechanics and engineering (e.g., tensile or compressive strain).
Stress or tension that develops in relationships or circumstances (e.g., “strain on a partnership”).
A strain in the context of computing/software engineering, such as naming used for versions or variants in some tool ecosystems.