definition of
basis

[1] #1 basis n. [footing, ground] a relation that provides the foundation for something; "they were on a friendly footing"; "he worked on an interim basis". wn

[2] #2 basis n. [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". wn

[3] #3 basis n. [base] the most important or necessary part of something; "the basis of this drink is orange juice". wn