say it: BAY-suhs
basis is a noun meaning "a relation that provides the foundation for something". It carries 3 recorded senses.
a relation that provides the foundation for something
“they were on a friendly footing”
“he worked on an interim basis”
the fundamental assumptions from which something is begun or developed or calculated or explained
“the whole argument rested on a basis of conjecture”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for basis come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.