Definition of precociousness in US English:

precociousness

noun

  • See precocious

    • ‘Her style has always been proof of her precociousness.’
    • ‘They provide hours of amusement with their lively chatter, playfulness, precociousness and curiosity.’
    • ‘Much of this show feels like promising student work, poised between prank and precociousness.’
    • ‘Hmm… while I can agree that the dialogue is weak (at times) and that the little boy's precociousness is unnecessary, I think the rest of the film was nearly flawless.’
    • ‘Taken aback by the teenager's precociousness, the police chiefs sent him away to do a law degree first.’

Pronunciation

precociousness

/prəˈkōSHəsnəs/