Nidation is a specific term used to describe the process of a fertilized egg implanting into the uterus. This term is often used in the medical field. However, there are several synonyms that can be used instead of nidation to describe this process. Some of the synonyms include implantation, engraftment, and apposition. These terms are often used interchangeably with nidation in medical language. Other synonyms for nidation include adhesion, sticking, and attachment. These words can be used to describe the process of the egg sticking to the uterine wall. Regardless of the synonym used, the process of a fertilized egg implanting is a crucial step in the creation of human life.