Definition of axiom
1 : a maxim widely accepted on its intrinsic merit
2 : a statement accepted as true as the basis for argument or inference : postulate 1
3 : an established rule or principle or a selfevident truth
Examples of axiom in a sentence
one of the key axioms of the theory of evolution
Did You Know?
In mathematics or logic, an axiom is an unprovable rule or first principle accepted as true because it is selfevident or particularly useful. “Nothing can both be and not be at the same time and in the same respect” is an example of an axiom. The term is often used interchangeably with postulate, though the latter term is sometimes reserved for mathematical applications (such as the postulates of Euclidean geometry). It should be contrasted with a theorem, which requires a rigorous proof.
Origin and Etymology of axiom
Latin axioma, from Greek axiōma, literally, something worthy, from axioun to think worthy, from axios worth, worthy; akin to Greek agein to weigh, drive — more at agent
First Known Use: 15th century
Other Logic Terms
AXIOM Defined for English Language Learners
axiom
playDefinition of axiom for English Language Learners

: a rule or principle that many people accept as true
AXIOM Defined for Kids
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Spanish Central: Translation of axiom Nglish: Translation of axiom for Spanish speakers Britannica English: Translation of axiom for Arabic speakers Britannica.com: Encyclopedia article about axiom
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