NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,847 terms related to cancer and medicine.
Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.
- listen (vy-TA-lih-tee)
- A term used to describe a person’s ability to live, grow, and develop. Vitality also refers to having energy and being vigorous and active. Being ill or being treated for a disease, such as cancer, may lessen a person’s vitality.