The Collaborative International Dictionary of English v.0.48:

Puberty \Pu"ber*ty\, n. [L. pubertas, fr. puber, pubes, adult:
   cf. F. pubert['e].]
   1. The earliest age at which persons are capable of begetting
      or bearing children, usually considered, in temperate
      climates, to be about fourteen years in males and twelve
      in females.
      [1913 Webster]

   2. (Bot.) The period when a plant first bears flowers.
      [1913 Webster]

WordNet (r) 3.0 (2006):

puberty
    n 1: the time of life when sex glands become functional [syn:
         puberty, pubescence]