lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower"
education or instruction in the fundamentals of a field of knowledge; "he lacks the foundation necessary for advanced study"; "a good grounding in mathematics"
an institution supported by an endowment
the basis on which something is grounded; "there is little foundation for his objections"
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface; allows swimmer to breathe while face down in the water