I have access to definite definition to terminology like stress(Pa), strain(dimensionless), ultimate strength(Pa), yield strength(Pa), etc. But I often get confused when someone just write "strength". I give an example. Consider the following sentence: "Titanium has high strength and high stiffness." What is the strength referring here? Is it a measurable variable, or a qualitative description? If it is measurable, what is its unit, and in a typical stress-strain graph of a ductile material, where is this variable located?