0 the condition of showing mental development or achievement much earlier than usual: --
I thought I was strong and independent, but it was just precociousness.
She has a precociousness that verges on brattishness.
Once so full of promise and precociousness, the golfer hasn't won a tournament in 19 months.
His parents had recognized his musical precociousness.
He says that the precociousness of children with psychological problems is neither cute nor enviable.
He exhibits a rare combination of precociousness and modesty.
The piece marks the turning point in Mozart's career, where he left youthful precociousness behind and entered his own realm of genius.