1. An intense or violent exertion; SYN. straining, stress.
2. Injury to a muscle (often caused by overuse); results in swelling and pain.
3. (Physics) Deformation of a physical body under the action of applied forces.
4. Nervousness resulting from mental stress; SYN. mental strain, nervous strain.
The ratio of the change in length to the initial unstressed reference length.
In the science of materials, the extent to which a body is distorted when a deforming force (stress) is applied to it. It is a ratio of the extension or compression of that body (its length, area, or volume) to its original dimensions (see Hooke's law. For example, linear strain is the ratio of the change in length of a body to its original length.