Open English Wordnet
Nouns
(n)foundationthe basis on which something is grounded“there is little foundation for his objections”
(n)foundation, base, fundament, foot, groundwork, substructure, understructurelowest support of a structure“it was built on a base of solid rock”, “he stood at the foot of the tower”
(n)foundation, groundingeducation or instruction in the fundamentals of a field of knowledge“he lacks the foundation necessary for advanced study”, “a good grounding in mathematics”
(n)basis, base, foundation, fundament, groundwork, cornerstonethe fundamental assumptions from which something is begun or developed or calculated or explained“the whole argument rested on a basis of conjecture”
(n)foundation garment, foundationa woman's undergarment worn to give shape to the contours of the body
(n)initiation, founding, foundation, institution, origination, creation, innovation, introduction, instaurationthe act of starting something for the first time; introducing something new“she looked forward to her initiation as an adult”, “the foundation of a new scientific society”