axiom
noun
[ ˈaksɪəm ]
• a statement or proposition which is regarded as being established, accepted, or self-evidently true.
• "the axiom that sport builds character"
Similar:
accepted truth,
general truth,
dictum,
truism,
principle,
proposition,
postulate,
maxim,
saying,
adage,
aphorism,
apophthegm,
gnome,
Origin:
late 15th century: from French axiome or Latin axioma, from Greek axiōma ‘what is thought fitting’, from axios ‘worthy’.