Dictionary & Thesaurus

1.

(noun) the fundamental assumptions underlying an explanation; "the whole argument rested on a basis of conjecture"

Synonyms: base, cornerstone, foundation, fundament, groundwork

Related Words: assumption, supposition

2.

(noun) a relation that provides the foundation for something; "they were on a friendly footing" or "he worked on an interim basis"

Synonyms: footing, ground

Related Words: common ground, foundation