adjective
axiomatic
ak-see-uh-MAT-ik/ˌæksiəˈmætɪk/
Taken as a foundational truth without proof.
It is axiomatic that the whole is greater than a part.

Etymology
Greek axiōma meant “authority,” literally something thought worthy or fit. This became the idea of a self-evident truth, so an axiomatic statement is accepted without needing proof.
In context
I hope that it is axiomatic—others have made this point—that everyone in the chamber must abhor hateful, abusive, horrendous and disgusting remarks
More examples
- It is axiomatic in this organization that safety comes first.
- The researcher examined the theory's axiomatic foundations.
- The claim once seemed axiomatic, but new evidence challenged it.
Forms
axiom noun — A statement accepted as a basis for reasoning.
Similar words
- self-evident
- Suggests obvious truth rather than a formally chosen starting assumption.
- fundamental
- Means basic or important without implying acceptance without proof.