basis Definition

basis
noun bases (plural)

1. A principle on which an idea or theory, etc is based.

Thesaurus: foundation, base, ground, root, cornerstone.
2. A foundation or starting point.

Example: a basis for discussion
Thesaurus: justification, proof, evidence, reason, source, authority, premise, sanction, raison d'être, postulate, antecedent.
3. The main part of a mixture.

Example: using tomato as the basis for the sauce

Etymology: 16c in its original meaning‘the lowest part'.