S: (n) foundation, grounding (education or instruction in the fundamentals of a field of knowledge) "he lacks the foundation necessary for advanced study"; "a good grounding in mathematics"
S: (n) basis, base, foundation, fundament, groundwork, cornerstone (the fundamental assumptions from which something is begun or developed or calculated or explained) "the whole argument rested on a basis of conjecture"
S: (n) foundation garment, foundation (a woman's undergarment worn to give shape to the contours of the body)