assurance

noun

1
freedom from doubt; belief in yourself and your abilities
his assurance in his superiority did not make him popular
after that failure he lost his confidence
2
a statement intended to inspire confidence
the President's assurances were not respected
3
a binding commitment to do or give or refrain from something
an assurance of help when needed
signed a pledge never to reveal the secret
4
a British term for some kinds of insurance

Also useful for “assurance”:Unscrambler— Rearrange the letters in “assurance”