No, Albert Einstein did not coin the term "curvature" in his works "The Foundation of the General Theory of Relativity" and "The Field Equations of Gravitation." The term "curvature" has been used in mathematics and geometry for centuries before Einstein's time.
In his works on general relativity, Einstein did, however, introduce the concept of "curvature" in the context of spacetime. He described how the presence of mass and energy causes spacetime to curve, and this curvature influences the motion of objects in the presence of gravity. Einstein's theory of general relativity revolutionized our understanding of gravity by describing it in terms of spacetime curvature.
It's worth noting that Einstein's work built upon the earlier mathematical formalism developed by Riemannian geometry, which extensively discussed the concept of curvature in a mathematical context. Einstein applied these mathematical ideas to the physical realm in the development of his theory of general relativity.