a belief or notion, not based on reason or knowledge, in or of the ominous significance of a particular thing, circumstance, occurrence, proceeding, or the like.

a system or collection of such beliefs.

a custom or act based on such a belief.

irrational fear of what is unknown or mysterious, esp. in connection with religion.

any blindly accepted belief or notion.

noun

fact , reality , truth

noun

false belief , fear , irrationality , notion , shibboleth * , unfounded fear , idolatry , magic , voodoo