A Conceit

1. (obsolete) Something conceived in the mind; an idea, a thought. [14th–18th c.]
2. The faculty of conceiving ideas; mental faculty; apprehension.
3. Quickness of apprehension; active imagination; lively fancy.
4. (obsolete) Opinion, (neutral) judgment. [14th–18th c.]
5. (now rare, dialectal) Esteem, favourable opinion. [from 15th c.]
6. (countable) A novel or fanciful idea; a whim. [from 16th c.]
7. (countable, rhetoric, literature) An ingenious expression or metaphorical idea, especially in extended form or used as a literary or rhetorical device. [from 16th c.]
8. (uncountable) Overly high self-esteem; vain pride; hubris. [from 17th c.]
9. Design; pattern.