1 a A group of individuals born and living about the same time. B A group of generally contemporaneous individuals regarded as. Having common cultural or social characteristics and attitudes. C A stage or period of sequential technological development and innovation. A new generation of computers. 2 The act or process of generating.

A mastectomy is surgery to remove a breast. It is performed either to treat or to prevent breast cancer. Only high-risk patients have surgery to prevent cancer. Total mastectomy - removal of breast tissue and nipple. Modified radical mastectomy - removal of the breast, most of the lymph nodes under the arm and often the lining over the chest muscles. Lumpectomy - surgery to remove the tumor and a small amount of normal tissue around it.