Dictionary
ax•i•om
Pronunciation: (ak'sē-um), [key]—
n.
1. a self-evident truth that requires no proof.
2. a universally accepted principle or rule.
3. Logic, Math.a proposition that is assumed without proof for the sake of studying the consequences that follow from it.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.