1. (noun) an incorrect conception

• delusion
• hallucination
• erroneous belief
• error
• fallacy
• false belief
• fancy
• fantasy
• illusion
• phantasy
• mirage
• misapprehension
• mistake
• misunderstanding
• self-deceit
• self-deception
• unsoundness

1. (noun) an incorrect conception

• idea
• thought

1. (noun) an incorrect conception

• be amiss
• misapprehend
• misconceive
• misconstrue
• misinterpret
• misunderstand

1. (noun) an incorrect conception

• concept
• conception
• construct