n The act of straining, or the state of being strained.
n A violent effort; an excessive and hurtful exertion or tension, as of the muscles.
n An injury resulting from violent effort; a sprain.
n (uncountable)(engineering) The amount by which a material deforms under stress or force, given as a ratio of the deformation to the initial dimension of the material and typically symbolised by ε is termed the engineering strain. The true strain is defined as the natural logarithm of the ratio of the final dimension to the initial dimension.