Definify.com
Webster 1913 Edition
Delusion
1.
The act of deluding; deception; a misleading of the mind.
Pope.
2.
The state of being deluded or misled.
3.
That which is falsely or delusively believed or propagated; false belief; error in belief.
“A fanatic, either religious or political, is the subject of strong delusions; while the term illusion is applied solely to the visions of an uncontrolled imagination, the chimerical ideas of one blinded by hope, passion, or credulity, or lastly, to spectral and other ocular deceptions, to which the word delusion is never applied.” Whately.
Webster 1828 Edition
Delusion
DELUSION
,Noun.
1.
The act of deluding; deception; a misleading of the mind. We are all liable to the delusions of artifice.2.
False representation; illusion; error or mistake proceeding from false views.And fondly mournd the dear delusion gone.