maturity

成熟、完全な発達(発育)

(noun) The state or quality of being fully grown or developed.
(noun) The state or quality of being mature.
(noun) The time at which a note or bond is due.
(noun) The state of a note or bond being due.
(noun) Geology A stage in the development of streams or landscapes at which maximum development has been reached or at which the process of erosion is going on with maximum vigor. Maturity of a landscape continues throughout the period of maximum topographic differentiation or until about three fourths of the original mass is carried away by erosion.

The filling of the juvenile mind, long before nature brings the body to maturity, with impure imaginations, not only preoccupies the ground which is greatly needed for something else, and fills it with shoots of a noxious growth, but actually induces, if I may so say, a _precocious maturity_.