(physics) the principle that (within the elastic limit) the stress applied to a solid is proportional to the strain produced WordNet 3.0 & Open English WordNet

In physics, Hooke's law is an empirical law which states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance—that is, Fs = kx, where k is a constant factor characteristic of the spring, and x is small compared to the total possible deformation of the spring. Wikipedia

Empirical physical law of mechanics that the force on a spring is proportional to its displacement Wikidata

The principle that the stress applied to a solid is directly proportional to the strain produced. This law describes the behavior of springs and solids stressed within their elastic limit. Wiktionary

Principle that stress applied to a solid is proportional to strain produced. Wiktionary (translation)