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]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PUBERTY, civil law. The age in boys after fourteen years until full age, and
in girls after twelve years until full age. Ayl. Pand. 63; Hall's Pract. 14;
Toull. Dr. Civ. Fr. tom. 6, p. 100; Inst. 1, 22; Dig. 1, 7, 40, 1; Code, 5,
60, 3.