The period between childhood and adolescence, between the ages of about 9 and 11 for girls, and 10 and 12 for boys.
The age at which a person is first capable of sexual reproduction.
The process of sexual development that produces secondary sex characteristics and makes a person capable of reproducing sexually.
The period when a plant begins to flower.
A developmental phase brought about by the action of hormones as part of the maturing process. For humans, there are three in total.