Noah Webster
Ignorance
IG'NORANCE, noun [Latin ignorantia; ignoro, not to know; ignarus, ignorant; in and gnarus, knowing.]
1. Want, absence or destitution of knowledge; the negative state of the mind which has not been instructed in arts, literature or science, or has not been informed of facts. ignorance may be general, or it may be limited to particular subjects. ignorance of the law does not excuse a man for violating it. ignorance of facts if often venial.
Ignorance is preferable to error.
2. Ignorances, in the plural, is used sometimes for omissions or mistakes; but the use is uncommon and not to be encouraged.