Strength

This relates to the maximum force which can be applied to a material without it breaking.

In a material, strength refers to a level of stress at which there is a significant change in the state of the material, e.g., yielding or rupture.

In a structure, strength refers to a level of level of loading which produces a significant change in the state of the structure, e.g., inelastic deformations, buckling, or collapse.