BASIS definition: 1. the most important facts, ideas, etc. from which something is developed: 2. a way or method of…. Learn more.

: the bottom of something considered as its foundation. Fruit juice constitutes the basis of jelly. He is on a first-name basis with his customers.

Basis is the underlying reason or assumption. The basis of a dictionary is that people are curious to learn the meanings of new words. You are interested, right?

a basic fact, amount, standard, etc., used in making computations, reaching conclusions, or the like: The nurse is paid on an hourly basis. He was chosen on the basis of his college grades.

Oct 31, 2025 · basis (plural bases or (rare) baseis or (nonstandard) basises) A physical base or foundation. quotations 1695, William Congreve, To the King, on the taking of Namur, 1810, …

Bases are the plural noun referring to several foundations, substances, or central points, while basis is a singular noun meaning the main supporting principle for something.

There are 13 meanings listed in OED's entry for the noun basis, four of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Basis definition: the bottom or base of anything; the part on which something stands or rests.. See examples of BASIS used in a sentence.

BASIS meaning: 1 : something (such as an idea or set of ideas) from which another thing develops or can develop usually singular; 2 : a reason for doing something

1. a bottom or base; the part on which something stands or rests. 2. anything upon which something is based; a fundamental principle. 3. the principal constituent; fundamental ingredient.