Describing something that is self-evident, accepted as true without needing proof, or based on fundamental principles.
From 'axiom' (a statement accepted as true) plus the adjectival suffix '-ical'. The root 'axios' means worthy or fit in Greek, as axioms are statements 'worthy' of acceptance.
When something is axiomatical, it's like the foundation of a building—you don't question it because everything else depends on it being true.
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