olemus
(a) üldkeeles: tõestuseta tõeseks loetav väide
Wiktionary:
1. (philosophy) a seemingly self-evident or necessary truth which is based on assumption; a principle or proposition which cannot actually be proved or disproved.
(b) loogikas, matemaatikas:
ISO/IEC 21838-1:
muude väidete tuletamise aluseks võetav tõestuseta tõeseks loetav väide
= statement that is taken to be true, to serve as a premise for further reasoning
https://en.wikipedia.org/wiki/Axiom
https://en.wikipedia.org/wiki/List_of_axioms
(c) infoturbes:
põhjapanev infoturvapoliitika nõue, arhitektuuriprintsiip või reegel
= a fundamental policy requirement, architectural principle, or security rule
https://www.iso27000.es/assets/files/ISO27k%20Organization%20of%20information%20security.docx