Webster's English Dictionary

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axiom

ax.i.om \'ak-se--*m\ n [L axioma, fr. Gk axio-ma, lit., honor, fr. axioun 
   to thin]k worthy, fr. axios worth, worthy; akin to Gk agein to drive 1: a 
   maxim widely accepted on its intrinsic merit  2a: a proposition regarded as 
   a self-evident truth  2b: POSTULATE